Data processing: financial – business practice – management – or co – Business processing using cryptography
Reexamination Certificate
2007-02-15
2010-11-23
Reagan, James A (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
C705S051000, C705S054000, C705S057000, C705S059000, C380S227000, C380S228000, C380S229000, C380S230000, C380S201000, C380S202000, C380S203000, C380S204000, C726S001000
Reexamination Certificate
active
07840487
ABSTRACT:
Disclosure of information is controlled selectively depending on users such that a plurality of users having different roles bearing no inclusive relation with one another can access the same area. Content is divided into a plurality of areas. For each of the areas obtained by division, secret keys (encryption/decryption keys in symmetric-key cryptography) are generated. The generated keys are encrypted using public keys in public-key cryptography, which are set in advance for the users depending on their respective roles. In the case where the content is to be disclosed to a plurality of users having different roles, the encryption of secret keys is performed separately for each user. These encrypted contents and encrypted secret keys are used to generate encrypted text.
REFERENCES:
patent: 6212280 (2001-04-01), Howard et al.
patent: 6442690 (2002-08-01), Howard et al.
patent: 6587837 (2003-07-01), Spagna et al.
patent: 6671805 (2003-12-01), Brown et al.
patent: 6892306 (2005-05-01), En-Seung et al.
patent: 7174460 (2007-02-01), Horita et al.
patent: 7181016 (2007-02-01), Cross et al.
patent: 7382883 (2008-06-01), Cross et al.
patent: 2003/0145197 (2003-07-01), Lee et al.
patent: 2002-366030 (2002-12-01), None
patent: 2003-5645 (2003-01-01), None
patent: 2005-135072 (2005-05-01), None
Chengqing Li: Cryptanalyses of Some Multimedia Encryption Schemes (May 2005). Retrieved from GOOGLE Jul. 18, 2010.
Steinfeld, R., et al., “Content Extraction Signatures”, Lecture Notes in Computer Science, Dec. 6, 2001, p. 285-304, vol. 2288, Springer Verlag, New York, NY, US.
Hatano Yasuo
Matsumoto Kenji
Miyazaki Kunihiko
Shimizu Yoji
Hitachi , Ltd.
McDermott Will & Emery LLP
Reagan James A
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