Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2006-12-26
2006-12-26
Moazzami, Nasser (Department: 2136)
Cryptography
Communication system using cryptography
Time segment interchange
C380S036000, C380S201000, C380S259000, C380S261000, C713S168000, C726S030000
Reexamination Certificate
active
07155011
ABSTRACT:
The present invention relates to an encryption method for encrypting information including a series of multiple unit blocks, one at a time, a decryption method for decrypting multiple encrypted unit blocks, one at a time, and a recording and reproducing apparatus that uses those methods. The seed of an encryption key for encrypting each unit block and the seed of an encryption key for decrypting each encrypted unit block, which are used by those methods and the recording and reproducing apparatus, are based on a unit block that is one or more unit blocks before the current unit block in a reproduction order or on information generated by encrypting one or more unit blocks before the current unit block. Alternatively, the seed of an encryption key for encrypting each unit block and the seed of an encryption key for decrypting each encrypted unit block are information based on an encryption key for encrypting a unit block before the current unit block in a reproduction order.
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Wohlmacher, P., ‘Introduction to the Taxonomy of Multiple Cryptography’, Multimedia andSecurity Workshop, ACM '99, Oct. 1999, pp. 7-15, wwwiti.cs.uni-magdeburg.de/iti—amsl/acm/acm99/GMD—report.pdf.
Higurashi Seiji
Inoha Wataru
Kuroiwa Toshio
Sugahara Takayuki
Ueda Kenjiro
Baum Ronald
Kang Gregory B.
Moazzami Nasser
Nath Gary M.
Nath & Associates PLLC
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