Electrical computers and digital processing systems: support – Data processing protection using cryptography – Computer instruction/address encryption
Reexamination Certificate
2011-06-21
2011-06-21
Zand, Kambiz (Department: 2434)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
Computer instruction/address encryption
C726S031000, C726S032000, C726S033000
Reexamination Certificate
active
07966499
ABSTRACT:
Systems and methods related to concealing mathematical and logical operations in software. Mathematical and logical operations are disguised by replacing them with logically equivalent expressions. Each equivalent expression has at least two expression constants whose values are based on scaling and bias constants assigned to variables in the original mathematical or logical operation. Each of the expression constants may also be based on additive or multiplicative inverses modulo n of the scaling and bias constants. By replacing the original operations with more complex but logically equivalent expressions containing variables that also involve more operations, the true nature of the original operations is disguised.
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Kandanchatha Arun Narayanan
Zhou Yongxin
Borden Ladner Gervais LLP
Harriman Dant B Shaifer
Irdeto Canada Corporation
Kinsman Leslie A.
Zand Kambiz
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