Definicja dual signature

A cryptographic procedure introduced by SET, an electronic payment system, to ensure data protection during business transactions.

This type of signature is generated by calculating hash values

separately for two messages, concatenating the two hashresults to a new message, and then hashing that value and encrypting the result. This procedure allows you to combine two messages in such a way that the recipient can only read the part of the message intended for him or for her.