Design of a Cryptographic Tamper Detection Scheme for Network Security

In the present research work an attempt has been made to design and implement a tamper detection scheme that provides an additional procedure which detects tampering, given two signatures, whether one of them was generated by the forger. In this system, emails and files are signed digitally. The scheme automatically computes a hash based on the exact content of the email message, and then encrypts the value with the sender's private key. The recipient of the email will use their tamper evidence software to compute the same calculation. The matching of the calculation with the hash value is a proof that the message has not been altered. It ensures the data integrity, confidentiality and authentication.