Other

Hitachi, Ltd.

Fujitsu Corporation

Hiroyoshi Tsuchiya

Naoya Torii

Seiichi Domyo

Kazue Sako

Hiroshi Miyauchi

Yasutsugu Kuroda

Hiroyuki Ando

Masashi Yamazaki

Seiko Kanno

Ichirou Morita

Kazuo Takaragi

Eiji Okamoto

Ichir{overscore (o)}u M{overscore (o)}rita

Kozo Fujisaki

Masahiro Mambo

Toshiaki Oda

Takeshi Tanida

Junichiro Takagi

Tooru Kawai

A time information display system includes: a storage unit for storing document data; a date/time character string detecting unit for detecting whether or not a character string is contained with a character string of the document data; a relative date/time detecting unit operated in detecting a date/time expression by the date/time character string detecting unit, the relative date/time detecting unit detects whether or not a date/time character string is equal to a relative date/time expression; an absolute date/time converting unit for converting the relative date/time expression into an absolute date/time expression; a unit for storing the absolute date/time character string; a unit for calculating difference date/time between present date/time and the absolute date/time; a relative date/time converting unit for converting the calculated difference date/time into relative date/time with respect to the present date/time; and a storage unit for storing the relative date/time character string.

Time information display system

An information processing method is provided which allows each shop in a cyber shopping site to continue its operation even if some errors of merchandise data are found in each of a plurality of data processes. More specifically, an error rate of input merchandise data is calculated at each process, and if the error rate is equal to or larger than a data error allowable threshold value, the next process is performed in order to continue the operation of the shop.

Information processing method and system with execution thresholds allowable to input data errors

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.

Key recovery condition encryption and decryption apparatuses

The present invention has an object to overcome problems of a key recovery system using a conventional KRF system and to achieve efficient operation of the overall key recovery system. A key recovery system of the present invention includes check units,for checking whether a user has a recovery authorization for a common key KS, on the basis of a recovery condition RC specified by a recovery condition index RCI which is added to an encrypted message (encrypted message obtained by encrypting the common key KS with a public key KRCpub) supplied from a terminal (,to,) of the user concerned, and a key recovery control unit,which is provided separately from the check units,and decrypts the encrypted message with a private key KRCpri paired with the public key KRCpub to recover the common key. The check unit,supplies the common key KS recovered in the key recovery control unit,to the user concerned only when the user has the recovery authorization.

Key recovery system and key recovery method

A key recovery information distribution device is provided between a recoverer device and a key recovery device, recovers a data key for the recoverer device, and reduces the load of the recoverer device. Data is encrypted using the data key and stored with key recovery information. The recoverer device which decrypts the encrypted data distributes the key recovery information to key recovery devices through the key recovery information distribution device to recover key information. A recoverer is authenticated directly between the key recovery device and the recoverer device, and then the key information is transmitted to the recoverer device, and the recoverer device recovers the data key.

Key recovery system

When a secret is encrypted and stored, it is necessary to provide a countermeasure for the situation where a key is lost (key recovery system). In the present invention, a key recovery system for an enveloped data format in which a common key is used to encrypt a plaintext (secret) and a user's public key is used to encrypt the common key and attached to an encrypted text is provided. In the present invention, only the common key is decrypted to recover the secret without reconstruction of split secret keys kept in a plurality of key storage apparatuses.

Encrypted data recovery method using split storage key and system thereof

Growing community of inventors

Yokohama, Japan

Hiroyoshi Tsuchiya