Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2007-04-24
2007-04-24
Vu, Kim (Department: 2135)
Cryptography
Communication system using cryptography
Time segment interchange
C713S189000, C380S036000, C380S042000, C380S044000, C380S046000
Reexamination Certificate
active
11261562
ABSTRACT:
An encryption apparatus for block data, comprises a first processing unit randomizing the block data in units of first portions obtained by dividing the block data, and a second processing unit diffusing the block data output from the first processing unit with respect to a second portion of the block data which is wider than the first portion. The first processing unit comprises first nonlinear processing units nonlinearly transforming the block data in units of the first portions. The second processing unit comprises a first linear diffusion processing unit linearly diffusing the second portion of the block data. At least one of the first nonlinear processing units comprises second nonlinear processing units nonlinearly transforming the block data in units of the first portions, and a second linear diffusion processing unit linearly diffusing the second portion of the block data.
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Kawamura Shin'ichi
Muratani Hirofumi
Ohkuma Kenji
Sano Fumihiko
Pich Ponnoreay
Vu Kim
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