Digital signature generator/verifier/recorder (DS-GVR) for analog transmissions

摘要: A method and apparatus authenticates provides non-repudiability for analog messages which renders it impossible a person, including the recipient, who is not in possession of (cryptographic) key belonging to claimed sender, forge message. The recipient able verify that sender possessed correct key, third party (judge) can establish whether message was forged or not. This accomplished by interposing digital signature generator/verifier/recorder (DS-GVR) module sending apparatus, such as facsimile machine. receiver, using another DS-GVR, received document comes from purported has been altered enroute. receiver's DS-GVR be made produce machine-readable record signed transmission. Retention receiver prevents repudiating legitimate messages, because enables prove judge corresponding generated receiver.