Cryptographic communication method and cryptographic communication device
Patent 5136642 Issued on August 4, 1992. Estimated Expiration Date: 
May 31, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 31, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSoftware protection system Key distribution method Public/key date-time notary facility Public key/signature cryptosystem with enhanced digital signature certification Electronic notary Cipher-key distribution system Patent #: 5029208 InventorsAssigneeApplicationNo. 708361 filed on 05/31/1991US Classes:380/282, By public key method380/30, Public key713/152, Application layer security713/171Having key exchangeExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmInternational ClassH04L 009/02Foreign Application Priority Data1990-06-01 JPAbstractA cryptographic communication method comprises a step for carrying out cryptographic communication between a sending station and one or more receiving stations by using (1) a ciphertext formed by encrypting a unit of sending information under the intervention of at least a cryptographic key and (2) key-distribution-information produced by using at least the ciphertext, receiving station's public information, and randomized information generated in the sending station. | |
