A new digital signature scheme

Authentication plays an important role in cryptography. It allows Alice to have high confidence that the message she received originated from Bob, but it does not allow her to convince a third party that Bob actually sent the message. This makes authentication suitable between two trusting parties. In this paper, we introduce a new signature scheme that allows Alice to sign a message and let Bob verify its integrity. Moreover, it does not let Alice later on deny her signature and allows Bob to decide either to verify the invalidity of the signature block or assume that Alice´s denial is false.