Method for conducting data encryption and decryption using symmetric cryptography algorithm and table look-up device
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United States of America Patent
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Jun 21, 2016
Grant Date -
Jun 18, 2015
app pub date -
Jun 9, 2013
filing date -
Jun 18, 2012
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Abstract
Disclosed are a method for conducting data encryption and decryption using a symmetric cryptography algorithm and a table look-up device. The method comprises: when it is determined that it is required to use S-boxes to look up a table in a symmetric cryptography algorithm, determining all types of S-boxes to be used; for each type of S-box, determining the total number Ni of the type of S-box, and when Ni is larger than 1, determining that the type of S-box meets a multiplexing condition; and when data encryption and decryption are conducted using the symmetric cryptography algorithm, multiplexing at least one type of S-box which meets the multiplexing condition. The present application can reduce the occupation by the symmetric cryptography algorithm of hardware resources under the condition of comparative shortage of hardware resources.
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