Signatures with efficient protocols (CL Signature
Camenisch-Lysyanskaya) are a form of Digital Signature
invented by Jan Camenisch and Anna Lysyanskaya in 2001
In addition to being secure Digital Signatures, they need to allow for the efficient implementation of two protocols:
In applications the first protocol
allows a signer in possession of the signing key
, to issue a Digital Signature
to a user (the signature owner) without learning all the messages
being signed or the complete signature.
The second protocol allows the signature owner to prove that he has a signature on a number of messages, without revealing the Digital Signature and only a (possibly) empty subset of the messages.
The combination of these two protocols allows for the implementation of digital credential and ecash protocols.
Signatures with efficient protocols may have United States and other country Patents
Signatures with efficient protocols is a form of a Group Signatures
Signatures with efficient protocolss have been enhanced since the original.
There might be more information for this subject on one of the following: