Method for program protection based on .NET card and a system thereof

A system for program protection based on a smart card, comprising a smart card, a first device and a second device, wherein

• the smart card comprises:
• a storage module adapted to store a first assembly obtained by compiling first source code;
• an interface module adapted to communicate with the second device when the first assembly stored in the storage module is invoked by the second device;
• an execution module adapted to execute the first assembly when the first assembly stored in the storage module is invoked by the second device,
• the first device comprises:
• a parsing module adapted to parse and obtain a remotely invoked class in the first source code;
• a processing module adapted to extract a namespace and a method of the class obtained by the parsing module to form a new class, and write in the new class an instruction for remotely invoking the class in the first source code to generating second source code, wherein the new class is formed by an empty function;
• a compiling module adapted to compile the first source code into the first assembly, and compile the second source code obtained by the processing module into a second assembly,
• the second device comprises:
• a storage module adapted to store the second assembly generated by the compiling module of the first device;
• an invocation module adapted to execute the second assembly stored in the storage module of the second device, and invoke the first assembly stored in the smart card via an interface of the smart card when the remote invocation instruction is executed, and receive an execution result returned by the smart card via the interface of the smart card.