Digital Signature - A digital signature...
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A digital signature may need to be used as the basis for resolving a dispute between the originator and recipient of a message, such as a check (cheque), or business document.
RSA Digital Signature
This is a simplistic digital signature technique (named after its creators – Ronald Rivest, Adi Shamir and Len Adleman). It is one of the most popular public – key algorithms. It can be used for both encryption and digital signature. The originator of a message generates an encrypted version of the message, using RSA in authentication mode (that is, the encryption key is the private key of the originator). This encrypted version of the message is sent attached to a copy of the plaintext message. The recipient’s system, (which needs to know the corresponding decryption key - the public key of the originator), decrypts the encrypted version of the message content and compares it with the plaintext version. If the two are the same, the recipient can be assured that the originating system possessed the encryption key, and that the message contents were not changed en route.
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