US Patent 9225512 Encryption and decryption using a physically unclonable function

Approaches for using a physically unclonable function (PUF) as a key-encrypting key are disclosed. Data is encrypted using a session key, and at least one PUF value is generated from a PUF. The session key and a correctness indicator are encrypted into a corresponding session key pair using the PUF value. Each session key pair is added to the encrypted data. Subsequent decryption, using a subsequently generated PUF value, of the correctness indicator to an expected value indicates a valid decryption. Decryption may be repeated using a different PUF value if the correctness indicator does not match the expected value. In another approach, the session key may be omitted and the payload data may be encrypted with the different PUF values and paired with correctness indicators.