ファイルの暗号化・復号化プログラム、プログラム格納媒体

Title:

ファイルの暗号化・復号化プログラム、プログラム格納媒体

Document Type and Number:

Japanese Patent JP4764639

Kind Code:

B2

Abstract:

[Object] To achieve both information confidentiality management and early discovery of information leak. [Solution] A file encrypting/decrypting program makes a computer execute a process including a step of creating a session key (a1); a step of encrypting a file (f1) with the key (a1), thereby creating a file (f2); a step of encrypting the key (a1) with a public key (b1) , thereby creating a key (a2); a step of encrypting the key (a1) with a public key (c1), thereby creating a key (a3); and a step of creating a combined file (f3) including the file (f2) and the keys (a2, a3); and a process including a step of separating the file(f3) into the file (f2) and the keys (a2, a3); a decrypting step of decrypting the file (f2) into the file (f1) with the key (a1) ; a step of decrypting the key (a2) into the key (a1) with a private key (b2) corresponding to the key (b1) and then proceeding to the decrypting step; and a step of decrypting the key (a3) into the key (a1) with a private key (c2) corresponding to the key (c1) and then proceeding to the decrypting step.

More Like This:

WO/1996/033565	METHOD FOR SIGNATURE AND SESSION KEY GENERATION
JP2021190909	ENCRYPTION COMMUNICATION SYSTEM, ENCRYPTION CLIENT DEVICE, PROGRAM, AND ENCRYPTION COMMUNICATION METHOD
JP4771942	Personal information management device, distributed key storage device, personal information management system, personal information management method, computer program, recording medium and integrated circuit

Inventors:

Kawai Masayuki
Hiroyuki Nishikawa

Application Number:

JP2005021359A

Publication Date:

September 07, 2011

Filing Date:

January 28, 2005

Export Citation:

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Assignee:

Oak Information System Co., Ltd.
Hokuriku NEC Software Co., Ltd.

International Classes:

H04L9/08

Domestic Patent References:

JP2000267565A
JP7056507A
JP11346210A
JP11015373A
JP2002344438A
JP2000099385A
JP9046330A

Other References:

高木浩光,公開鍵暗号方式の誤り解説の氾濫をそろそろどげんかせんと,インターネット,2008年 2月 9日,URL,http://takagi-hiromitsu.jp/diary/20080229.html
稲村雄,電子署名≠秘密鍵で暗号化,インターネット,2003年 7月19日,URL,http://www.vicus-oryzae.com/gorua/sign.html
smoking186,暗号と署名の話,インターネット,2008年 3月 2日,URL,http://d.hatena.ne.jp/smoking186/20080302/1204451511
Rivest, R. L., Shamir, A., Adleman, L.,A Method for Obtaining Digital Signatures and Public-Key Cryptosystems,Communications of the ACM,1978年 2月,Volume 21 Number 2,p.120-126

Attorney, Agent or Firm:

Isshiki International Patent Service Corporation

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