Enciphering/deciphering device and method, and encryption/decryption communication system
Patent 5870477 Issued on February 9, 1999. Estimated Expiration Date: 
March 29, 2016. 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.
March 29, 2016. 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 ReferencesPublic key cryptosystem key management based on control vectors Method for generating public and private key pairs without using a passphrase Patent #: 5201000 InventorsAssigneeApplicationNo. 619601 filed on 03/29/1996US Classes:713/165, File protection380/30, Public key380/277KEY MANAGEMENTExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmForeign Patent References
International ClassH04L 009/00Foreign Application Priority Data1993-09-29 JPAbstractA plaintext file 41 is enciphered using a file key 44, to generate ciphertext 42. The file key 44 is enciphered using a secret key 47 and a management key 48, respectively, to form an enciphered key 1 (45) and an enciphered key 2 (46). An enciphered file 43 is produced from the ciphertext 42, the enciphered key 1 and the enciphered key 2. At the time of decryption, the enciphered key 1 is taken out from the enciphered file 43. The enciphered key 1 taken out is deciphered using a secret key 47, to obtain a file key 44. The ciphertext 42 is deciphered using the file key 44, to obtain the plaintext 41.Other References
Field of SearchPublic key | |
