Patent ID: 6108783
Filing Date: 2000-08-22
Classification: H04L

Abstract:
A method for providing a non-repudiable commitment of a signer to the contents of a digitally signed document, containing a message m, to a recipient, said method comprising the steps of:a) the recipient generating public and private chameleon hash keys and a chameleon hash function;b) the signer generating a public verification key and a private signature key;c) the signer utilizing said chameleon hash function and said public chameleon hash key to compute a chameleon hash value of said message m;d) the signer applying said private signature key to said chameleon hash value to generate a chameleon signature of said message m;e) transmitting said chameleon signature and said message m to said recipient;f) verifying said chameleon signature for a message m using said chameleon hash function, said public chameleon hash key and said public verification key.