Chapter: Cryptography and Network Security

Digital Signatures

have looked at message authentication- but does not address issues of lack of trust

DIGITAL SIGNATURES

o have looked at message authentication- but does not address issues of lack of trust

o digital signatures provide the ability to:

^§verify author, date & time of signature

^§authenticate message contents

^§be verified by third parties to resolve disputes

o hence include authentication function with additional capabilities

Digital Signature Properties

o must depend on the message signed

o must use information unique to sender-to prevent both forgery and denial

o must be relatively easy to produce

o must be relatively easy to recognize & verify

o be computationally infeasible to forge

^§with new message for existing digital signature

^§with fraudulent digital signature for given message

o be practical save digital signature in storage

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Cryptography and Network Security : Digital Signatures |