Abstract:
In data and telecommunication, cryptography is necessary when communicating over untrusted medium. With the development of network and software technology, digital signature becomes more and more important for the e-communication .The data transferred on e-communication system must have the characteristic of anti-deniability, integrity and confidentiality. In cryptography, RSA is widely used algorithm for the public key cryptography. The SHA hash functions are a set of cryptographic secure hash functions .This paper proposes a reliable office communication based on RSA and SHA-1. This system is implemented by C#.Net programming language.
