Construction of a Sanitizable Signature and Its Application in Blockchain

A sanitizable signature allows the signer delegate partial signing rights to a trusted sanitizer, who can change certain fields of the original message, while the authenticity of other data in the message is still verifiable. In this paper, the core component of the chameleon hash of the sanitizable signature is improved based on elliptic curves, and a security proof is provided. The experimental results show that the proposed chameleon hash and the corresponding sanitizable signature have high computational efficiency under the same security strength. This paper also proposes a sanitizable signature scheme that can be applied to blockchain evaluation, which can protect sensitive information while verifying the authenticity of user data.