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Key Replacement Attack on a Certificateless Signature Scheme

Key Replacement Attack on a Certificateless Signature Scheme. Zhenfeng Zhang and Dengguo Feng Presenter: Yu-Chi Chen. Outline. Yap-Heng-Goi Certificateless Signature Scheme Public Key Replacement Attack on the Yap-Heng-Goi Scheme Remark. CL-PKC. CL-PKC is better than PKC and ID-PKC.

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Key Replacement Attack on a Certificateless Signature Scheme

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  1. Key Replacement Attack on a Certificateless Signature Scheme Zhenfeng Zhang and Dengguo Feng Presenter: Yu-Chi Chen

  2. Outline Yap-Heng-Goi Certificateless Signature Scheme Public Key Replacement Attack on the Yap-Heng-Goi Scheme Remark

  3. CL-PKC • CL-PKCis better than PKCand ID-PKC. • CL-PKC does not need the certificate for identity and the management about certificate. • CL-PKC solves the key escrow problem in ID-PKC. • KGC only generatesthe user’s partial-private-key.

  4. Yap-Heng-Goi scheme Sign: Verify:

  5. An Attack on the Yap-Heng-Goi Scheme Replacement attack: An attacker uses public key replacement to generate a forged signature without knowing the master-key. The forged signature is valid via the verification.

  6. An Attack on the GS Scheme The attacker chooses a randomandreplaces A's public key with the value It is able to generate a signature This signature (U,V) can be valid via Verify.

  7. Remark. For example for signature, Remarks of the public key replacement attack.

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