diff --git a/core/paddlefl_mpc/mpc_protocol/abstract_context.h b/core/paddlefl_mpc/mpc_protocol/abstract_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..1b6deab31154bf647eef605e6156d4d2d3c0970b
--- /dev/null
+++ b/core/paddlefl_mpc/mpc_protocol/abstract_context.h
@@ -0,0 +1,127 @@
+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include <algorithm>
+#include <memory>
+
+#include "core/paddlefl_mpc/mpc_protocol/abstract_network.h"
+#include "core/privc3/prng_utils.h"
+#include "paddle/fluid/platform/enforce.h"
+
+namespace paddle {
+
+namespace mpc {
+
+using block = psi::block;
+using PseudorandomNumberGenerator = psi::PseudorandomNumberGenerator;
+
+class AbstractContext {
+public:
+  AbstractContext(size_t party, std::shared_ptr<AbstractNetwork> network) {
+    set_party(party);
+    set_network(network);
+  };
+  AbstractContext(const AbstractContext &other) = delete;
+
+  AbstractContext &operator=(const AbstractContext &other) = delete;
+
+  void set_party(size_t party) {
+    _party = party;
+  }
+
+  void set_num_party(size_t num_party) {
+    _num_party = num_party;
+  }
+
+  void set_network(std::shared_ptr<AbstractNetwork> network) {
+    _network = network;
+  }
+
+  AbstractNetwork *network() { return _network.get(); }
+
+  void set_random_seed(const block &seed, size_t idx) {
+    PADDLE_ENFORCE_LE(idx, _num_party,
+                     "prng idx should be less and equal to %d.",
+                     _num_party);
+    get_prng(idx).set_seed(seed);
+  }
+
+  size_t party() const { return _party; }
+
+  size_t pre_party() const {
+    return (_party + _num_party - 1) % _num_party;
+  }
+
+  size_t next_party() const {
+    return (_party + 1) % _num_party;
+  }
+
+  // generate random from prng[0] or prng[1]
+  // @param next: use bool type for idx 0 or 1
+  template <typename T> T gen_random(bool next) {
+    return get_prng(next).get<T>();
+  }
+
+  template <typename T, template <typename> class Tensor>
+  void gen_random(Tensor<T> &tensor, bool next) {
+    std::for_each(
+        tensor.data(), tensor.data() + tensor.numel(),
+        [this, next](T &val) { val = this->template gen_random<T>(next); });
+  }
+
+  template <typename T> T gen_random_private() { return get_prng(2).get<T>(); }
+
+  template <typename T, template <typename> class Tensor>
+  void gen_random_private(Tensor<T> &tensor) {
+    std::for_each(
+        tensor.data(), tensor.data() + tensor.numel(),
+        [this](T &val) { val = this->template gen_random_private<T>(); });
+  }
+
+  template <typename T> T gen_zero_sharing_arithmetic() {
+    return get_prng(0).get<T>() - get_prng(1).get<T>();
+  }
+
+  template <typename T, template <typename> class Tensor>
+  void gen_zero_sharing_arithmetic(Tensor<T> &tensor) {
+    std::for_each(tensor.data(), tensor.data() + tensor.numel(),
+                  [this](T &val) {
+                    val = this->template gen_zero_sharing_arithmetic<T>();
+                  });
+  }
+
+  template <typename T> T gen_zero_sharing_boolean() {
+    return get_prng(0).get<T>() ^ get_prng(1).get<T>();
+  }
+
+  template <typename T, template <typename> class Tensor>
+  void gen_zero_sharing_boolean(Tensor<T> &tensor) {
+    std::for_each(
+        tensor.data(), tensor.data() + tensor.numel(),
+        [this](T &val) { val = this->template gen_zero_sharing_boolean<T>(); });
+  }
+
+protected:
+  virtual PseudorandomNumberGenerator& get_prng(size_t idx) = 0;
+
+private:
+  size_t _num_party;
+  size_t _party;
+  std::shared_ptr<AbstractNetwork> _network;
+};
+
+} // namespace mpc
+
+} //namespace paddle
diff --git a/core/paddlefl_mpc/mpc_protocol/aby3_operators.h b/core/paddlefl_mpc/mpc_protocol/aby3_operators.h
index 369b02c03a0829900d9aea722e93a7bdf12a744b..337d1fb581c72839503c195c1b131e0a2cf7d189 100644
--- a/core/paddlefl_mpc/mpc_protocol/aby3_operators.h
+++ b/core/paddlefl_mpc/mpc_protocol/aby3_operators.h
@@ -21,7 +21,8 @@ limitations under the License. */
 #include "context_holder.h"
 #include "mpc_operators.h"
 #include "paddle/fluid/framework/tensor.h"
-#include "core/privc3/circuit_context.h"
+#include "core/privc3/boolean_tensor.h"
+#include "core/privc3/aby3_context.h"
 #include "core/privc3/fixedpoint_tensor.h"
 #include "core/privc3/boolean_tensor.h"
 #include "core/privc3/paddle_tensor.h"
@@ -30,7 +31,7 @@ namespace paddle {
 namespace mpc {
 
 using paddle::framework::Tensor;
-using aby3::CircuitContext;
+using aby3::ABY3Context;
 // TODO: decide scaling factor
 const size_t ABY3_SCALING_FACTOR = FIXED_POINTER_SCALING_FACTOR;
 using FixedTensor = aby3::FixedPointTensor<int64_t, ABY3_SCALING_FACTOR>;
diff --git a/core/paddlefl_mpc/mpc_protocol/aby3_protocol.cc b/core/paddlefl_mpc/mpc_protocol/aby3_protocol.cc
index a4cc939ab00b6d06558f72d8d4f6778ffd221cee..8ec5a1d239a7476beaaf515da1dbd1028a230615 100644
--- a/core/paddlefl_mpc/mpc_protocol/aby3_protocol.cc
+++ b/core/paddlefl_mpc/mpc_protocol/aby3_protocol.cc
@@ -48,7 +48,7 @@ void Aby3Protocol::init_with_store(
   mesh_net->init();
 
   _network = std::move(mesh_net);
-  _circuit_ctx = std::make_shared<CircuitContext>(role, _network);
+  _circuit_ctx = std::make_shared<ABY3Context>(role, _network);
   _operators = std::make_shared<Aby3OperatorsImpl>();
   _is_initialized = true;
 }
@@ -63,7 +63,7 @@ std::shared_ptr<AbstractNetwork> Aby3Protocol::network() {
   return _network;
 }
 
-std::shared_ptr<CircuitContext> Aby3Protocol::mpc_context() {
+std::shared_ptr<AbstractContext> Aby3Protocol::mpc_context() {
   PADDLE_ENFORCE(_is_initialized, PROT_INIT_ERR);
   return _circuit_ctx;
 }
diff --git a/core/paddlefl_mpc/mpc_protocol/aby3_protocol.h b/core/paddlefl_mpc/mpc_protocol/aby3_protocol.h
index 6940c558d4bcdf842cae8775ad8fa1f93670b3f2..5d2d7d73cbcbada189c0449ec5bd06b8c735b6e5 100644
--- a/core/paddlefl_mpc/mpc_protocol/aby3_protocol.h
+++ b/core/paddlefl_mpc/mpc_protocol/aby3_protocol.h
@@ -24,12 +24,13 @@
 #include "mesh_network.h"
 #include "mpc_operators.h"
 #include "mpc_protocol.h"
-#include "core/privc3/circuit_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
+#include "core/privc3/aby3_context.h"
 
 namespace paddle {
 namespace mpc {
 
-using CircuitContext = aby3::CircuitContext;
+using ABY3Context = aby3::ABY3Context;
 
 class Aby3Protocol : public MpcProtocol {
 public:
@@ -46,14 +47,14 @@ public:
 
   std::shared_ptr<AbstractNetwork> network() override;
 
-  std::shared_ptr<CircuitContext> mpc_context() override;
+  std::shared_ptr<AbstractContext> mpc_context() override;
 
 private:
   bool _is_initialized = false;
   const std::string PROT_INIT_ERR = "The protocol is not yet initialized.";
   std::shared_ptr<MpcOperators> _operators;
   std::shared_ptr<AbstractNetwork> _network;
-  std::shared_ptr<CircuitContext> _circuit_ctx;
+  std::shared_ptr<AbstractContext> _circuit_ctx;
 };
 
 } // mpc
diff --git a/core/paddlefl_mpc/mpc_protocol/context_holder.cc b/core/paddlefl_mpc/mpc_protocol/context_holder.cc
index 9acf0fb72667c7da8b53b842b3189f26c337f923..3cbd8b8ce4c0979dbd7551581f930c897b0a0d74 100644
--- a/core/paddlefl_mpc/mpc_protocol/context_holder.cc
+++ b/core/paddlefl_mpc/mpc_protocol/context_holder.cc
@@ -24,7 +24,7 @@
 namespace paddle {
 namespace mpc {
 
-thread_local std::shared_ptr<CircuitContext> ContextHolder::current_mpc_ctx;
+thread_local std::shared_ptr<AbstractContext> ContextHolder::current_mpc_ctx;
 
 thread_local const ExecutionContext *ContextHolder::current_exec_ctx;
 
diff --git a/core/paddlefl_mpc/mpc_protocol/context_holder.h b/core/paddlefl_mpc/mpc_protocol/context_holder.h
index a8c2d5f15764cc49463790761310d181abd04edf..710de07f189c2c63e926051fe0a38cb0a65212a4 100644
--- a/core/paddlefl_mpc/mpc_protocol/context_holder.h
+++ b/core/paddlefl_mpc/mpc_protocol/context_holder.h
@@ -22,20 +22,20 @@
 #pragma once
 
 #include "paddle/fluid/framework/operator.h"
-#include "core/privc3/circuit_context.h"
+#include "core/privc3/aby3_context.h"
 #include "core/privc3/paddle_tensor.h"
 
 namespace paddle {
 namespace mpc {
 
-using CircuitContext = aby3::CircuitContext;
+using ABY3Context = aby3::ABY3Context;
 using ExecutionContext = paddle::framework::ExecutionContext;
 
 class ContextHolder {
 public:
   template <typename Operation>
   static void run_with_context(const ExecutionContext *exec_ctx,
-                               std::shared_ptr<CircuitContext> mpc_ctx,
+                               std::shared_ptr<AbstractContext> mpc_ctx,
                                Operation op) {
 
     // set new ctxs
@@ -60,7 +60,7 @@ public:
     _s_current_tensor_factory = old_factory;
   }
 
-  static std::shared_ptr<CircuitContext> mpc_ctx() { return current_mpc_ctx; }
+  static std::shared_ptr<AbstractContext> mpc_ctx() { return current_mpc_ctx; }
 
   static const ExecutionContext *exec_ctx() { return current_exec_ctx; }
 
@@ -77,7 +77,7 @@ public:
   }
 
 private:
-  thread_local static std::shared_ptr<CircuitContext> current_mpc_ctx;
+  thread_local static std::shared_ptr<AbstractContext> current_mpc_ctx;
 
   thread_local static const ExecutionContext *current_exec_ctx;
 
diff --git a/core/paddlefl_mpc/mpc_protocol/mpc_instance_test.cc b/core/paddlefl_mpc/mpc_protocol/mpc_instance_test.cc
index dfb8f4a452dfcbec6ecfc707847cacb4db721558..68daf78b328c1c4624eed6b3aee9272f3bd8126a 100644
--- a/core/paddlefl_mpc/mpc_protocol/mpc_instance_test.cc
+++ b/core/paddlefl_mpc/mpc_protocol/mpc_instance_test.cc
@@ -19,7 +19,6 @@
 
 #include "aby3_protocol.h"
 #include "mpc_protocol_factory.h"
-#include "core/privc3/circuit_context.h"
 #include "gtest/gtest.h"
 
 namespace paddle {
diff --git a/core/paddlefl_mpc/mpc_protocol/mpc_protocol.h b/core/paddlefl_mpc/mpc_protocol/mpc_protocol.h
index da1aa49de70bbd92dbbdfa60785602ce4397b47f..a5eeae6c26c5dcff53bf2de1bb0aedd505e6b9c0 100644
--- a/core/paddlefl_mpc/mpc_protocol/mpc_protocol.h
+++ b/core/paddlefl_mpc/mpc_protocol/mpc_protocol.h
@@ -21,7 +21,7 @@
 #include "gloo/rendezvous/hash_store.h"
 #include "mpc_config.h"
 #include "mpc_operators.h"
-#include "core/privc3/circuit_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
 
 namespace paddle {
 namespace mpc {
@@ -44,7 +44,7 @@ public:
 
   virtual std::shared_ptr<AbstractNetwork> network() = 0;
 
-  virtual std::shared_ptr<aby3::CircuitContext> mpc_context() = 0;
+  virtual std::shared_ptr<AbstractContext> mpc_context() = 0;
 
 private:
   const std::string _name;
diff --git a/core/paddlefl_mpc/mpc_protocol/mpc_protocol_test.cc b/core/paddlefl_mpc/mpc_protocol/mpc_protocol_test.cc
index 332536bceb08096b45a63e9f600d81732bfa7b67..199e046ebbc3d48d078dff60001ecc2cc2f8bc83 100644
--- a/core/paddlefl_mpc/mpc_protocol/mpc_protocol_test.cc
+++ b/core/paddlefl_mpc/mpc_protocol/mpc_protocol_test.cc
@@ -17,7 +17,6 @@
 #include "aby3_protocol.h"
 #include "mpc_config.h"
 #include "mpc_protocol_factory.h"
-#include "core/privc3/circuit_context.h"
 #include "gtest/gtest.h"
 
 namespace paddle {
diff --git a/core/paddlefl_mpc/operators/mpc_op.h b/core/paddlefl_mpc/operators/mpc_op.h
index 6cff543b0dbf03f13a9e8baeb83335986f5fe249..f3a17941463c0beb45b847dbbd3faa680bc3ca53 100644
--- a/core/paddlefl_mpc/operators/mpc_op.h
+++ b/core/paddlefl_mpc/operators/mpc_op.h
@@ -19,7 +19,7 @@ limitations under the License. */
 #include "paddle/fluid/framework/operator.h"
 #include "core/paddlefl_mpc/mpc_protocol/mpc_instance.h"
 #include "core/paddlefl_mpc/mpc_protocol/context_holder.h"
-#include "core/privc3/circuit_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
 
 namespace paddle {
 namespace operators {
@@ -32,7 +32,7 @@ public:
         PADDLE_ENFORCE_NOT_NULL(mpc::MpcInstance::mpc_instance()->mpc_protocol(),
                                 "Mpc protocol is not yet initialized in executor");
 
-        std::shared_ptr<aby3::CircuitContext> mpc_ctx(mpc::MpcInstance::mpc_instance()->mpc_protocol()->mpc_context());
+        std::shared_ptr<mpc::AbstractContext> mpc_ctx(mpc::MpcInstance::mpc_instance()->mpc_protocol()->mpc_context());
         mpc::ContextHolder::template run_with_context<>(&ctx, mpc_ctx,
                 [&] { ComputeImpl(ctx); });
     }
diff --git a/core/privc/privc_context.h b/core/privc/privc_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..35b67a7e9c948099883e4343c3d5dfe26f8eaff2
--- /dev/null
+++ b/core/privc/privc_context.h
@@ -0,0 +1,54 @@
+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include <algorithm>
+#include <algorithm>
+#include <memory>
+
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/abstract_network.h"
+#include "prng_utils.h"
+
+namespace aby3 {
+
+using AbstractNetwork = paddle::mpc::AbstractNetwork;
+using AbstractContext = paddle::mpc::AbstractContext;
+
+class PrivCContext : public AbstractContext {
+public:
+  PrivCContext(size_t party, std::shared_ptr<AbstractNetwork> network,
+                 block seed = g_zero_block):
+                 AbstractContext::AbstractContext(party, network) {
+    set_num_party(2);
+
+    if (psi::equals(seed, psi::g_zero_block)) {
+      seed = psi::block_from_dev_urandom();
+    }
+    set_random_seed(seed, 0);
+  }
+
+  PrivCContext(const PrivCContext &other) = delete;
+
+  PrivCContext &operator=(const PrivCContext &other) = delete;
+
+protected:
+  PseudorandomNumberGenerator& get_prng(size_t idx) override {
+    return _prng;
+  }
+private:
+  PseudorandomNumberGenerator _prng;
+};
+
+} // namespace aby3
diff --git a/core/privc3/aby3_context.h b/core/privc3/aby3_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..8094d9d67640fb8098f6ce97c3e5050e287d6e63
--- /dev/null
+++ b/core/privc3/aby3_context.h
@@ -0,0 +1,75 @@
+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#include <algorithm>
+#include <algorithm>
+#include <memory>
+
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/abstract_network.h"
+#include "prng_utils.h"
+
+namespace aby3 {
+
+using AbstractNetwork = paddle::mpc::AbstractNetwork;
+using AbstractContext = paddle::mpc::AbstractContext;
+
+class ABY3Context : public AbstractContext {
+public:
+  ABY3Context(size_t party, std::shared_ptr<AbstractNetwork> network,
+                 block seed = g_zero_block,
+                 block seed2 = g_zero_block) :
+                 AbstractContext::AbstractContext(party, network) {
+    set_num_party(3);
+
+    if (psi::equals(seed, psi::g_zero_block)) {
+      seed = psi::block_from_dev_urandom();
+    }
+
+    if (psi::equals(seed2, psi::g_zero_block)) {
+      seed2 = psi::block_from_dev_urandom();
+    }
+    set_random_seed(seed, 0);
+    // seed2 is private
+    set_random_seed(seed2, 2);
+
+    // 3 for 3-party computation
+    size_t party_pre = pre_party();
+    size_t party_next = next_party();
+
+    if (party == 1) {
+      block recv_seed = this->network()->template recv<block>(party_next);
+      this->network()->template send(party_pre, seed);
+      seed = recv_seed;
+    } else {
+      this->network()->template send(party_pre, seed);
+      seed = this->network()->template recv<block>(party_next);
+    }
+
+    set_random_seed(seed, 1);
+  }
+
+  ABY3Context(const ABY3Context &other) = delete;
+
+  ABY3Context &operator=(const ABY3Context &other) = delete;
+protected:
+  PseudorandomNumberGenerator& get_prng(size_t idx) override {
+    return _prng[idx];
+  }
+private:
+  PseudorandomNumberGenerator _prng[3];
+};
+
+} // namespace aby3
diff --git a/core/privc3/boolean_tensor.h b/core/privc3/boolean_tensor.h
index 36418a34dd1d56968aff9fcc7c4e55e03f9fb301..d8c66b22822be4812ff1bd240827f725accfc9c6 100644
--- a/core/privc3/boolean_tensor.h
+++ b/core/privc3/boolean_tensor.h
@@ -122,9 +122,9 @@ public:
     void onehot_from_cmp();
 
 private:
-    static inline std::shared_ptr<CircuitContext> aby3_ctx() {
-        return paddle::mpc::ContextHolder::mpc_ctx();
-    }
+  static inline std::shared_ptr<AbstractContext> aby3_ctx() {
+    return paddle::mpc::ContextHolder::mpc_ctx();
+  }
 
     static inline std::shared_ptr<TensorAdapterFactory> tensor_factory() {
         return paddle::mpc::ContextHolder::tensor_factory();
diff --git a/core/privc3/boolean_tensor_impl.h b/core/privc3/boolean_tensor_impl.h
index 012a158f4d8677787f7695035f06cab451e2dea3..74bf27090f17965d973630c9777d410e5087ec33 100644
--- a/core/privc3/boolean_tensor_impl.h
+++ b/core/privc3/boolean_tensor_impl.h
@@ -15,6 +15,7 @@
 #pragma once
 
 #include <algorithm>
+#include "core/privc3/ot.h"
 
 namespace aby3 {
 
@@ -268,7 +269,7 @@ void BooleanTensor<T>::ppa(const BooleanTensor* rhs,
 }
 
 template<typename T, size_t N>
-void a2b(CircuitContext* aby3_ctx,
+void a2b(AbstractContext* aby3_ctx,
          TensorAdapterFactory* tensor_factory,
          const FixedPointTensor<T, N>* a,
          BooleanTensor<T>* b,
@@ -432,9 +433,9 @@ void BooleanTensor<T>::mul(const TensorAdapter<T>* rhs,
         m[0]->add(tmp[0], m[0]);
         m[1]->add(tmp[0], m[1]);
 
-        aby3_ctx()->template ot(idx0, idx1, idx2, null_arg[0],
-                                const_cast<const aby3::TensorAdapter<T>**>(m),
-                                tmp, null_arg[0]);
+        ObliviousTransfer::ot(idx0, idx1, idx2, null_arg[0],
+                    const_cast<const aby3::TensorAdapter<T>**>(m),
+                    tmp, null_arg[0]);
 
         // ret0 = s2
         // ret1 = s1
@@ -445,18 +446,18 @@ void BooleanTensor<T>::mul(const TensorAdapter<T>* rhs,
         // ret0 = s1
         aby3_ctx()->template gen_zero_sharing_arithmetic(*(ret->mutable_share(0)));
         // ret1 = a * b + s0
-        aby3_ctx()->template ot(idx0, idx1, idx2, share(1),
-                                const_cast<const aby3::TensorAdapter<T>**>(null_arg),
-                                tmp, ret->mutable_share(1));
+        ObliviousTransfer::ot(idx0, idx1, idx2, share(1),
+                    const_cast<const aby3::TensorAdapter<T>**>(null_arg),
+                    tmp, ret->mutable_share(1));
         aby3_ctx()->network()->template send(idx0, *(ret->share(0)));
         aby3_ctx()->network()->template send(idx2, *(ret->share(1)));
     } else if (party() == idx2) {
         // ret0 = a * b + s0
         aby3_ctx()->template gen_zero_sharing_arithmetic(*(ret->mutable_share(1)));
         // ret1 = s2
-        aby3_ctx()->template ot(idx0, idx1, idx2, share(0),
-                                const_cast<const aby3::TensorAdapter<T>**>(null_arg),
-                                tmp, null_arg[0]);
+        ObliviousTransfer::ot(idx0, idx1, idx2, share(0),
+                    const_cast<const aby3::TensorAdapter<T>**>(null_arg),
+                    tmp, null_arg[0]);
 
         aby3_ctx()->network()->template send(idx0, *(ret->share(1)));
 
diff --git a/core/privc3/boolean_tensor_test.cc b/core/privc3/boolean_tensor_test.cc
index 984fbb5a81e45d6dd1eb8113fecbbd9425319f9b..21ccd31b8a8b828b29790cc6fb181f9cefb9efb2 100644
--- a/core/privc3/boolean_tensor_test.cc
+++ b/core/privc3/boolean_tensor_test.cc
@@ -27,19 +27,20 @@
 #include "boolean_tensor.h"
 #include "fixedpoint_tensor.h"
 #include "paddle_tensor.h"
-#include "circuit_context.h"
+#include "aby3_context.h"
 #include "core/paddlefl_mpc/mpc_protocol/mesh_network.h"
 
 namespace aby3 {
 
 using paddle::framework::Tensor;
+using AbstractContext = paddle::mpc::AbstractContext;
 
 class BooleanTensorTest : public ::testing::Test {
 public:
     paddle::platform::CPUDeviceContext _cpu_ctx;
 
     std::shared_ptr<paddle::framework::ExecutionContext> _exec_ctx;
-    std::shared_ptr<CircuitContext> _mpc_ctx[3];
+    std::shared_ptr<AbstractContext> _mpc_ctx[3];
 
     std::shared_ptr<gloo::rendezvous::HashStore> _store;
 
@@ -83,7 +84,7 @@ public:
     void gen_mpc_ctx(size_t idx) {
         auto net = gen_network(idx);
         net->init();
-        _mpc_ctx[idx] = std::make_shared<CircuitContext>(idx, net);
+        _mpc_ctx[idx] = std::make_shared<ABY3Context>(idx, net);
     }
 
     std::shared_ptr<TensorAdapter<int64_t>> gen1() {
diff --git a/core/privc3/circuit_context.h b/core/privc3/circuit_context.h
deleted file mode 100644
index ed75e31d8f1770537d7ca7ddde401e31de12246e..0000000000000000000000000000000000000000
--- a/core/privc3/circuit_context.h
+++ /dev/null
@@ -1,209 +0,0 @@
-// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-#pragma once
-
-#include <algorithm>
-#include <memory>
-
-#include "core/paddlefl_mpc/mpc_protocol/abstract_network.h"
-#include "prng_utils.h"
-
-namespace aby3 {
-
-using AbstractNetwork = paddle::mpc::AbstractNetwork;
-
-class CircuitContext {
-public:
-    CircuitContext(size_t party,
-                   std::shared_ptr<AbstractNetwork> network,
-                   const block& seed = g_zero_block,
-                   const block& seed2 = g_zero_block) {
-        init(party, network, seed, seed2);
-    }
-
-    CircuitContext(const CircuitContext& other) = delete;
-
-    CircuitContext& operator=(const CircuitContext& other) = delete;
-
-    void init(size_t party,
-              std::shared_ptr<AbstractNetwork> network,
-              block seed,
-              block seed2) {
-        set_party(party);
-        set_network(network);
-
-        if (equals(seed, g_zero_block)) {
-            seed = block_from_dev_urandom();
-        }
-
-        if (equals(seed2, g_zero_block)) {
-            seed2 = block_from_dev_urandom();
-        }
-        set_random_seed(seed, 0);
-        // seed2 is private
-        set_random_seed(seed2, 2);
-
-        // 3 for 3-party computation
-        size_t party_pre = (this->party() - 1 + 3) % 3;
-        size_t party_next = (this->party() + 1) % 3;
-
-        if (party == 1) {
-            block recv_seed = this->network()->template recv<block>(party_next);
-            this->network()->template send(party_pre, seed);
-            seed = recv_seed;
-        } else {
-            this->network()->template send(party_pre, seed);
-            seed = this->network()->template recv<block>(party_next);
-        }
-
-        set_random_seed(seed, 1);
-    }
-
-    void set_party(size_t party) {
-        if (party >= 3) {
-            // exception handling
-        }
-        _party = party;
-    }
-
-    void set_network(std::shared_ptr<AbstractNetwork> network) {
-        _network = network;
-    }
-
-    AbstractNetwork* network() {
-        return _network.get();
-    }
-
-    void set_random_seed(const block& seed, size_t idx) {
-        if (idx >= 3) {
-            // exception handling
-        }
-        _prng[idx].set_seed(seed);
-    }
-
-    size_t party() const {
-        return _party;
-    }
-
-    size_t pre_party() const {
-        return (_party + 3 - 1) % 3;
-    }
-
-    size_t next_party() const {
-        return (_party + 1) % 3;
-    }
-
-    template <typename T>
-    T gen_random(bool next) {
-        return _prng[next].get<T>();
-    }
-
-    template<typename T, template <typename> class Tensor>
-    void gen_random(Tensor<T>& tensor, bool next) {
-        std::for_each(tensor.data(), tensor.data() + tensor.numel(),
-                      [this, next](T& val) {
-                          val = this->template gen_random<T>(next);
-                      });
-    }
-
-    template <typename T>
-    T gen_random_private() {
-        return _prng[2].get<T>();
-    }
-
-    template<typename T, template <typename> class Tensor>
-    void gen_random_private(Tensor<T>& tensor) {
-        std::for_each(tensor.data(), tensor.data() + tensor.numel(),
-                      [this](T& val) {
-                          val = this->template gen_random_private<T>();
-                      });
-    }
-
-    template <typename T>
-    T gen_zero_sharing_arithmetic() {
-        return _prng[0].get<T>() - _prng[1].get<T>();
-    }
-
-    template<typename T, template <typename> class Tensor>
-    void gen_zero_sharing_arithmetic(Tensor<T>& tensor) {
-        std::for_each(tensor.data(), tensor.data() + tensor.numel(),
-                      [this](T& val) {
-                          val = this->template gen_zero_sharing_arithmetic<T>();
-                      });
-    }
-
-    template <typename T>
-    T gen_zero_sharing_boolean() {
-        return _prng[0].get<T>() ^ _prng[1].get<T>();
-    }
-
-    template<typename T, template <typename> class Tensor>
-    void gen_zero_sharing_boolean(Tensor<T>& tensor) {
-        std::for_each(tensor.data(), tensor.data() + tensor.numel(),
-                      [this](T& val) {
-                          val = this->template gen_zero_sharing_boolean<T>();
-                      });
-    }
-
-    template<typename T, template <typename> class Tensor>
-    void ot(size_t sender, size_t receiver, size_t helper,
-            const Tensor<T>* choice, const Tensor<T>* m[2],
-            Tensor<T>* buffer[2], Tensor<T>* ret) {
-        // TODO: check tensor shape equals
-        const size_t numel = buffer[0]->numel();
-        if (party() == sender) {
-            bool common = helper == next_party();
-            this->template gen_random(*buffer[0], common);
-            this->template gen_random(*buffer[1], common);
-            for (size_t i = 0; i < numel; ++i) {
-                buffer[0]->data()[i] ^= m[0]->data()[i];
-                buffer[1]->data()[i] ^= m[1]->data()[i];
-            }
-            network()->template send(receiver, *buffer[0]);
-            network()->template send(receiver, *buffer[1]);
-
-        } else if (party() == helper) {
-            bool common = sender == next_party();
-
-            this->template gen_random(*buffer[0], common);
-            this->template gen_random(*buffer[1], common);
-
-            for (size_t i = 0; i < numel; ++i) {
-                buffer[0]->data()[i] = choice->data()[i] & 1 ?
-                    buffer[1]->data()[i] : buffer[0]->data()[i];
-            }
-            network()->template send(receiver, *buffer[0]);
-        } else if (party() == receiver) {
-            network()->template recv(sender, *buffer[0]);
-            network()->template recv(sender, *buffer[1]);
-            network()->template recv(helper, *ret);
-            size_t i = 0;
-            std::for_each(ret->data(), ret->data() + numel, [&buffer, &i, choice, ret](T& in) {
-                          bool c = choice->data()[i] & 1;
-                          in ^= buffer[c]->data()[i];
-                          ++i;}
-                          );
-        }
-    }
-
-private:
-    size_t _party;
-
-    std::shared_ptr<AbstractNetwork> _network;
-
-    PseudorandomNumberGenerator _prng[3];
-
-};
-
-} // namespace aby3
diff --git a/core/privc3/fixedpoint_tensor.h b/core/privc3/fixedpoint_tensor.h
index 3fb2883d76a479af30fee1da67cf65ed980c60da..2346ad1f128823b6a2d4259e57fa249672ac5b53 100644
--- a/core/privc3/fixedpoint_tensor.h
+++ b/core/privc3/fixedpoint_tensor.h
@@ -16,7 +16,9 @@
 
 #include <vector>
 
-#include "circuit_context.h"
+#include "boolean_tensor.h"
+#include "aby3_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/context_holder.h"
 #include "paddle_tensor.h"
 #include "boolean_tensor.h"
 #include "core/paddlefl_mpc/mpc_protocol/context_holder.h"
@@ -195,9 +197,8 @@ public:
                         size_t scaling_factor);
 
 private:
-
-    static inline std::shared_ptr<CircuitContext> aby3_ctx() {
-        return paddle::mpc::ContextHolder::mpc_ctx();
+    static inline std::shared_ptr<AbstractContext> aby3_ctx() {
+      return paddle::mpc::ContextHolder::mpc_ctx();
     }
 
     static inline std::shared_ptr<TensorAdapterFactory> tensor_factory() {
diff --git a/core/privc3/fixedpoint_tensor_test.cc b/core/privc3/fixedpoint_tensor_test.cc
index c2f83189fc46535932fad8048d720aa408013a95..c525205b9a3a6adfcede17c5a6fdbd17944ab9b2 100644
--- a/core/privc3/fixedpoint_tensor_test.cc
+++ b/core/privc3/fixedpoint_tensor_test.cc
@@ -20,21 +20,23 @@ limitations under the License. */
 #include "paddle/fluid/framework/operator.h"
 #include "paddle/fluid/framework/scope.h"
 
+#include "aby3_context.h"
 #include "core/paddlefl_mpc/mpc_protocol/mesh_network.h"
 #include "core/paddlefl_mpc/mpc_protocol/context_holder.h"
 #include "fixedpoint_tensor.h"
 
 namespace aby3 {
 
-    using g_ctx_holder = paddle::mpc::ContextHolder;
-    using Fix64N16 = FixedPointTensor<int64_t, 16>;
+using g_ctx_holder = paddle::mpc::ContextHolder;
+using Fix64N16 = FixedPointTensor<int64_t, 16>;
+using AbstractContext = paddle::mpc::AbstractContext;
 
 class FixedTensorTest : public ::testing::Test {
 public:
 
     paddle::platform::CPUDeviceContext _cpu_ctx;
     std::shared_ptr<paddle::framework::ExecutionContext> _exec_ctx;
-    std::shared_ptr<CircuitContext> _mpc_ctx[3];
+    std::shared_ptr<AbstractContext> _mpc_ctx[3];
     std::shared_ptr<gloo::rendezvous::HashStore> _store;
     std::thread _t[3];
     std::shared_ptr<TensorAdapterFactory> _s_tensor_factory;
@@ -71,7 +73,7 @@ public:
     void gen_mpc_ctx(size_t idx) {
         auto net = gen_network(idx);
         net->init();
-        _mpc_ctx[idx] = std::make_shared<CircuitContext>(idx, net);
+        _mpc_ctx[idx] = std::make_shared<ABY3Context>(idx, net);
     }
 
     std::shared_ptr<TensorAdapter<int64_t>> gen(std::vector<size_t> shape) {
diff --git a/core/privc3/ot.h b/core/privc3/ot.h
new file mode 100644
index 0000000000000000000000000000000000000000..7bf33c7e46f0339c915dbbcf182f9bf96e680aa1
--- /dev/null
+++ b/core/privc3/ot.h
@@ -0,0 +1,67 @@
+// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include "core/paddlefl_mpc/mpc_protocol/abstract_context.h"
+#include "core/paddlefl_mpc/mpc_protocol/context_holder.h"
+
+namespace aby3 {
+
+class ObliviousTransfer {
+  public:
+  template<typename T, template <typename> class Tensor>
+  static inline void ot(size_t sender, size_t receiver, size_t helper,
+                  const Tensor<T>* choice, const Tensor<T>* m[2],
+                  Tensor<T>* buffer[2], Tensor<T>* ret) {
+    // TODO: check tensor shape equals
+    auto aby3_ctx = paddle::mpc::ContextHolder::mpc_ctx();
+    const size_t numel = buffer[0]->numel();
+    if (aby3_ctx->party() == sender) {
+      bool common = helper == aby3_ctx->next_party();
+      aby3_ctx->template gen_random(*buffer[0], common);
+      aby3_ctx->template gen_random(*buffer[1], common);
+      for (size_t i = 0; i < numel; ++i) {
+        buffer[0]->data()[i] ^= m[0]->data()[i];
+        buffer[1]->data()[i] ^= m[1]->data()[i];
+      }
+      aby3_ctx->network()->template send(receiver, *buffer[0]);
+      aby3_ctx->network()->template send(receiver, *buffer[1]);
+
+    } else if (aby3_ctx->party() == helper) {
+      bool common = sender == aby3_ctx->next_party();
+
+      aby3_ctx->template gen_random(*buffer[0], common);
+      aby3_ctx->template gen_random(*buffer[1], common);
+
+      for (size_t i = 0; i < numel; ++i) {
+        buffer[0]->data()[i] = choice->data()[i] & 1 ?
+            buffer[1]->data()[i] : buffer[0]->data()[i];
+      }
+      aby3_ctx->network()->template send(receiver, *buffer[0]);
+    } else if (aby3_ctx->party() == receiver) {
+      aby3_ctx->network()->template recv(sender, *buffer[0]);
+      aby3_ctx->network()->template recv(sender, *buffer[1]);
+      aby3_ctx->network()->template recv(helper, *ret);
+      size_t i = 0;
+      std::for_each(ret->data(), ret->data() + numel, [&buffer, &i, choice, ret](T& in) {
+                    bool c = choice->data()[i] & 1;
+                    in ^= buffer[c]->data()[i];
+                    ++i;}
+                    );
+    }
+  }
+};
+
+} // namespace aby3