Improved VLR Group Signature Based on DTDH Assumption

More Efficient VLR Group Signature Based on DTDH Assumption

In VLR (verifier-local revocation) group signature, only verifiers are involved in the revocation of a member, while signers are not. Thus the VLR group signature schemes are suitable for mobile environments. To meet the requirement of speediness, reducing computation costs and shortening signature length are two requirements at the current research of VLR group signatures. A new VLR group sign...

Shorter Verifier-local Revocation Group Signature Based on Dtdh Assumption

Membership revocation is an important issue in group signature. Verifier-Local revocation (VLR for short) is an effective method. In VLR group signature, revocation messages are only sent to signature verifiers (as opposed to both signers and verifiers). Consequently there is no need to contact individual signers when some user is revoked. Since signers have no load, VLR group signature schemes...

Backward Unlinkability for a VLR Group Signature Scheme with Efficient Revocation Check

Verifier-Local Revocation (VLR) group signatures, introduced by Boneh and Shacham in 2004 are a particular case of dynamic group signature schemes where the revocation process does not influence the activity of the signers. The verifiers use a Revocation List to check if the signers are revoked. In all known schemes, checking a signature requires a computational time linear in the number of rev...

A Directed Signature Scheme Based on RSA Assumption

A directed signature scheme allows a designated verifier to directly verify a signature issued to him, and a third party to check the signature validity with the help of the signer or the designated verifier as well. Due to its merits, the directed signature scheme can be applied on some personally or commercially sensitive occasions. Up to now, there are several directed signature schemes havi...

Signature S hemes Based on the Strong RSA Assumption