- First Online:
- Cite this paper as:
- Chaum D., van Heyst E. (1991) Group Signatures. In: Davies D.W. (eds) Advances in Cryptology — EUROCRYPT ’91. EUROCRYPT 1991. Lecture Notes in Computer Science, vol 547. Springer, Berlin, Heidelberg
only members of the group can sign messages;
the receiver can verify that it is a valid group signature, but cannot discover which group member made it;
if necessary, the signature can be “opened”, so that the person who signed the message is revealed.
We present four schemes that satisfy the properties above. Not all these schemes are based on the same cryptographic assumption. In some of the schemes a trusted centre is only needed during the setup; and in other schemes, each person can create the group he belongs to.