The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2001
Filed:
Jul. 07, 1998
Hiroshi Miyauchi, Tokyo, JP;
Kazue Sako, Tokyo, JP;
Masashi Yamazaki, Tokyo, JP;
Seiichi Domyo, Kanagawa, JP;
Hiroyoshi Tsuchiya, Kanagawa, JP;
Seiko Kanno, Kanagawa, JP;
Ichirou Morita, Kanagawa, JP;
Naoya Torii, Kanagawa, JP;
Hiroyuki Ando, Kanagawa, JP;
Yasutsugu Kuroda, Kanagawa, JP;
Other;
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 encryption 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.