Encipher method and decipher method
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United States of America Patent
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Jan 1, 1991
Grant Date -
N/A
app pub date -
Apr 27, 1989
filing date -
Apr 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There are provided an encipher method of enciphering message data made by a microcomputer or the like at a high speed by using encipher keys which have previously been stored in a smart card or the like and a decipher method of deciphering the ciphertext made by the encipher method at a high speed by using the encipher keys. The encipher method and the decipher method are suitable for, particularly, a 32-bit microcomputer and include a process expressed by the function Rot.sub.2 i(x) (i=2, 3, 4) in each process. Rot.sub.2 i(x) is the process to circular shift a data train x of 32 bits to the left or right by 2.sup.i bits (i=2, 3, 4).
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