Abstract: Blind signature is a special digital signature which can protect the user’s privacy. At present, most of the blind signature schemes use the bilinear pairings, so the cost of computing is relatively high, and a part of the schemes do not give the proof on security. To deal with these problems, a new blind signature scheme based on identity is proposed, it is proved to be security based on n-CDH problem in the random oracle model. The scheme does not use bilinear pairing in signing and uses only once bilinear pairing in verification, compared with other blind signature schemes, the cost of computing is lower.
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Key words: identity-based cryptography, blind signature, blindness, bilinear pairing