Symmetric Blind Decryption with Perfect Secrecy

Symmetric Blind Decryption with Perfect Secrecy

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A blind decryption scheme enables a user to query decryptions from a decryption GLUCOSAJOINT server without revealing information about the plain-text message.Such schemes are useful, for example, for the implementation of privacy-preserving encrypted file storages and payment systems.In terms of functionality, blind decryption is close to oblivious transfer.For noiseless channels, information-theoretically secure oblivious transfer is impossible.However, in this paper, we show that this is not the case for blind decryption.

We formulate Thermal Transfer a definition of perfect secrecy of symmetric blind decryption for the following setting: at most one of the scheme participants is a passive adversary (honest-but-curious).We also devise a symmetric blind decryption scheme based on modular arithmetic on a ring Zp2, where p is a prime, and show that it satisfies our notion of perfect secrecy.