Cryptography – Communication system using cryptography
Reexamination Certificate
2006-10-03
2006-10-03
Sheikh, Ayaz (Department: 2136)
Cryptography
Communication system using cryptography
C380S268000
Reexamination Certificate
active
07116783
ABSTRACT:
A method is provided for secured transfer of data from a first memory containing the data element to a second memory through a data bus that is connected between the first memory and the second memory. According to the method, a secret N-byte data element is transferred byte-by-byte through the data bus, with each byte transiting at least once on the data bus. Before each transfer of a byte of the secret data element, a current index ranging from 0 to N−1 is randomly chosen, with the current index corresponding to a place value of the byte to be transferred. At each transfer of a byte of the secret data element with a place value equal to the current index, a corresponding bit of an N-byte loading indicator is modified as a function of a loading mode, with the loading mode being an integer ranging from 0 to a first constant. The transfer of the secret data element is ended when the loading indicator takes a predetermined value.
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Bongini Stephen
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Hoffman Brandon
Sheikh Ayaz
STMicroelectronics S.A.
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