Enciphering/deciphering device and method, and encryption/decryption communication system
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United States of America Patent
Stats
-
Feb 9, 1999
Grant Date -
N/A
app pub date -
Mar 29, 1996
filing date -
Sep 29, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A 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.
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