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:
Oct. 08, 2013
Filed:
May. 12, 2006
Makoto Matsumoto, Hiroshima, JP;
Takuji Nishimura, Yamagata, JP;
Mutsuo Saito, Hiroshima, JP;
Mariko Hagita, Tokyo, JP;
Makoto Matsumoto, Hiroshima, JP;
Takuji Nishimura, Yamagata, JP;
Mutsuo Saito, Hiroshima, JP;
Mariko Hagita, Tokyo, JP;
Ochanomizu University, Tokyo, JP;
Hiroshima University, Hiroshima, JP;
Abstract
The pseudorandom number generating system repeatedly performs simple transformation of a non-secure pseudorandom number sequence that may be generated quickly, and thus may quickly generate a highly secure pseudorandom number sequence having a long period. Furthermore, the encryption system and the decryption system do not generate a large encryption function difficult to be deciphered based on a shared key, but prepare multiple functions, which perform fast, different types of transformation, and select a combination of functions determined based on information of the shared key, and make the selected functions transform a text multiple times, thereby encrypt the text. Each of the functions is fast, and thus transformation by the entire combination is also fast. Furthermore, since the combination of functions and repetitive count can be changed, future improvement in specification is easy. Moreover, security is high since which functions are applied in what order is unknown.