Provably Secure Partially Blind Signatures

  • Abe M
  • Okamoto T
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Abstract

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.

Author-supplied keywords

  • blind signatures
  • partially blind signatures
  • witness indistinguisha-

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Authors

  • Masayuki Abe

  • Tatsuaki Okamoto

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