Provably Secure Partially Blind Signatures

Partially blind signature schemes are an extension of blind signature schemes that allow a signer to explicitly include necessary information (expiration date, collateral conditions, or whatever) in the resulting signatures under some agreement with the receiver. This paper formalizes such a notion and presents secure and efficient schemes based on a widely applicable method of obtaining witness indistinguishable protocols. We then give a formal proof of security in the random oracle model. Our approach also allows one to construct secure fully blind signature schemes based on a variety of signature schemes.

• Type: Conference
• Year: 2000
• Where: CRYPTO
• Authors: Masayuki Abe, Tatsuaki Okamoto
• Keywords: Blind Signature Schemes, CRYPTO 2000, Cryptology, Efficient Schemes, Witness Indistinguishable Protocols