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Proxy blind multi-signature scheme without a secure channel

Proxy blind multi-signature scheme without a secure channel. Source: Applied Mathematics and Computation , vol: 164, issue: 1, May 5, 2005, pp. 179 - 187. Author: RongXing Lu, ZhenFu Cao, Yuan Zhou Speaker: Chang-Chu Chen Date: 05/26/2005. Outline. Introduction Proposed scheme

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Proxy blind multi-signature scheme without a secure channel

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  1. Proxy blind multi-signature scheme without a secure channel Source: Applied Mathematics and Computation, vol: 164, issue: 1, May 5, 2005, pp. 179 - 187. Author: RongXing Lu, ZhenFu Cao, Yuan Zhou Speaker: Chang-Chu Chen Date: 05/26/2005

  2. Outline • Introduction • Proposed scheme • Conclusions

  3. Keywords • Proxy signature • a proxy signer can sign any message on behalf of the original signer • Blind signature • authenticates a message without revealing any information about the sender • Multi-signature • multiple users sign on a single message

  4. Proxy blind multi-signature • Electronic cash • Anonymous electronic voting requester Original signers Proxy signer A1 secret blind signature A2 insecure channel B … C An

  5. Notations si: secret of Ai p, q : large prime, q | p -1 g : generator of Z*p with order q xi: private key of Ai yi: public key of Ai , xB: private key of B yB: public key of B, mw: designated proxy warrant negotiated by all original signers H( ), H1( ), H2( ) : universal secure hash functions m : message : published

  6. Proxy secret key phase Original signer Ai Proxy signer B ElGamal cipher text publish randomki , k’i

  7. Signing phase Proxy signer B Requester C randomw1 randomw2 , w3 proxy blind signature (e*, y*)

  8. Validation phase

  9. Satisfied properties • Verifiability • Anyone can verify a valid signature. • Unforgeability • Only proxy signer can generate a valid proxy blind multi-signature. • Unlinkability • Only signature requester can link this signature to the requester.

  10. Conclusion • Proposed a new proxy blind multi-signature scheme without a secure channel.

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