Functional Signatures and Pseudorandom Functions

Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
In digital signature schemes, as defined by Diffie and Hellman [DH76], a signature on a message provides information which enables the receiver to verify that the message has been created by a proclaimed sender. The sender has a secret signing key, used in the signing process, and there is a corresponding verification key, which is public and can be used by anyone to verify that a signature is valid. In this paper, the authors introduce two new cryptographic primitives: functional digital signatures and functional pseudorandom functions.

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