Fujitsu Corporation

The Foundation for the Promotion of Industrial Science

Seonghan Shin

Yusuke Sakai

Takeshi Shimoyama

Kazukuni Kobara

Hideki Imai

Goichiro Hanaoka

Toshiya Shimizu

An encryption processing system includes: a first device; second devices; and a third device, wherein the first device generates synthesis keys by selecting public keys of the second devices; generates an intermediate text from confidential texts generated by encrypting secret information by using public keys of the second devices having decryption authority; generates ciphertexts by further encrypting the intermediate text using the synthesis keys; and makes public the ciphertexts, each of the second devices verifies validity of the ciphertexts; generates decryption key fragments by using an own private key; and makes public the decryption key fragments, the third device verifies validity of the decryption key fragments; generates a decryption key by combining decryption key fragments; generates the Intermediate text by decrypting one of the ciphertexts; and makes public the intermediate text, and the second device decrypts the intermediate text using the own private key; and restores the secret information.

Encryption processing system and encryption processing method

An authentication system for mutual authentication between a terminal and a server characterized by the fact that the terminal comprises a memory means that pre-stores an authentication information P' for terminal storage; a concatenation means that yields a value P using a specific calculation formula with the input of the authentication information P&#x2032; read from the memory means and a password entered for authentication; a mask operation means that yields a value Yusing a specific calculation formula with the input of value P and an internally generated random number, and then sends Yto the server; and a master key generation means that yields a value MK using a specific calculation formula with the input of value P, an internally generated random number and a value Yreceived from the server, and the server comprises a memory means that pre-stores a password verification data H for server registration; a mask operation means that yields a value Yusing a specific calculation formula with the input of the password verification data H read from the memory means and an internally generated random number, and then sends Yto the terminal; and a master key generation means that yields a value MK using a specific calculation formula with the input of the password verification data H, an internally generated random number and a value Yreceived from the terminal.

Authentication system and remotely-distributed storage system

Growing community of inventors

Tokyo, Japan

Seonghan Shin