A GENERIC TRANSFORMATION TECHNIQUE FROM PUBLIC KEY ENCRYPTION TO PUBLIC KEY ENCRYPTION WITH EQUALITY TEST IN THE RANDOM ORACLE MODEL

摘要

Disclosed is a technology for converting from public key cryptography to public key cryptography capable of equivalence testing in a random oracle model. Public-key cryptography capable of equivalence testing has additional functions compared to existing public-key cryptography. If this function is used, it is possible to determine whether two given ciphertexts are the result of encryption of the same data, and it is said that an equality test is possible. By using the technology according to the embodiment, it is possible to convert from a secure public key cipher to a public key cipher that can be tested for equality in a random Oracle model. The public key cryptography method performed by the public key cryptography system may include converting the public key cryptography into a public key cryptography that can be tested for equality.