Title:
【発明の名称】鍵回復条件暗号化装置および復号装置
Document Type and Number:
Japanese Patent JP3076273
Kind Code:
B2
Abstract:
A key recovery condition encryption apparatus includes a hashing unit, a first concatenating unit, and a condition information encryption unit. The hashing unit calculates a hash value on the basis of a hash function using a key recovery information text serving as information necessary for performing key recovery. The first concatenating unit concatenates the hash value from the hashing unit to the key recovery condition. The condition information encrytion unit encrypts a concatenating result from the first concatenating unit by using a first encryption key. Also is disclosed a key recovery condition decryption apparatus for decrypting the encrypted data from the above encryption apparatus.
Inventors:
Hiroshi Miyauchi
Kazue Sako
Masafumi Yamazaki
Seiichi Domyo
Hiroya Tsuchiya
Seiko Kanno
Ichiro Morita
Naoya Torii
Hiroyuki Ando
Koji Kuroda
Kazue Sako
Masafumi Yamazaki
Seiichi Domyo
Hiroya Tsuchiya
Seiko Kanno
Ichiro Morita
Naoya Torii
Hiroyuki Ando
Koji Kuroda
Application Number:
JP18159397A
Publication Date:
August 14, 2000
Filing Date:
July 07, 1997
Export Citation:
Assignee:
日本電気株式会社
株式会社日立製作所
富士通株式会社
株式会社日立製作所
富士通株式会社
International Classes:
G09C1/00; H04L9/08; (IPC1-7): H04L9/08; G09C1/00
Domestic Patent References:
| JP1127253A | ||||
| JP1185015A | ||||
| JP1155244A |
Attorney, Agent or Firm:
Masaki Yamakawa