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Communication Dans Un Congrès Année : 2024

Taming Delegations in Anonymous Signatures: k-Times Anonymity for Proxy and Sanitizable Signature

Résumé

Fully traceable k-times anonymity is a security property concerning anonymous signatures: if a user produces more than k anonymous signatures, its identity is disclosed and all its previous signatures can be identified. In this paper, we show how this property can be achieved for delegation-supported signature schemes, especially proxy signatures, where the signer allows a delegate to sign on its behalf, and sanitizable signatures, where a signer allows a delegate to modify certain parts of the signed messages. In both cases, we formalize the primitive, give a suitable security model, provide a scheme and then prove its security under the DDH assumption. The size of the keys/signatures is logarithmic in k in our two schemes, making them suitable for practical applications, even for large k.
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Dates et versions

hal-04644979 , version 1 (11-07-2024)

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  • HAL Id : hal-04644979 , version 1

Citer

Xavier Bultel, Charles Olivier-Anclin. Taming Delegations in Anonymous Signatures: k-Times Anonymity for Proxy and Sanitizable Signature. CANS 2024 - International Conference on Cryptology and Network Security, Sep 2024, Cambridge, United Kingdom. ⟨hal-04644979⟩
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