Abstract: Comparing the characteristics of symmetric cryptography and asymmetric cryptography, this paper outlines the basic principles of the Triple DES algorithm and the RSA algorithm. On the basis of a detailed analysis of issues related to file security and in-depth study on .NET Framework encryption algorithm class, this paper proposes the file encryption scheme on the combination of the Triple DES algorithm and the RSA algorithm, designs the system’s overall structure and the basic process, then the system is realized with VB.NET. After practice, the results show that the system is simple and convenient for file encryption.
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Key words: Triple DES algorithm, RSA algorithm, .NET Framework, file, encryption