Secure Signatures and Chosen Ciphertext Security in a Quantum Computing World

Provided by: Stanford Technology Ventures Program
Topic: Security
Format: PDF
The authors initiate the study of quantum-secure digital signatures and quantum chosen ciphertext security. In the case of signatures, they enhance the standard chosen message query model by allowing the adversary to issue quantum chosen message queries: given a superposition of messages, the adversary receives a superposition of signatures on those messages. Similarly, for encryption, they allow the adversary to issue quantum chosen ciphertext queries: given a superposition of ciphertexts, the adversary receives a superposition of their decryptions.

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