Block ciphering system, using permutations to hide the core...

Details Block ciphering system, using permutations to hide the core... Block ciphering system, using permutations to hide the core...

2011-01-25

2011-01-25

Zand, Kambiz (Department: 2434)

Cryptography

Video cryptography

C380S210000, C726S026000

Reexamination Certificate

active

07876898

ABSTRACT:
In a system, a server provides a digital signal processing function ƒ to an executing device in an obfuscated form. The function ƒ includes a function cascade of signal processing functions ƒi, 1≦i≦N (e.g., FC1(x)≡ƒN∘ . . . ∘ƒ1(x)). The server includes a processor for selecting a set of 2N invertible permutations pi, 1≦i≦2N; calculating a set of N functions gi, where giis functionally equivalent to p2i−1∘ƒi∘p2i−1, for 1≦i≦N; and calculating a set of N−1 functions hi, where hiis functionally equivalent to p2i−1−1∘p2i−2, for 2≦i≦N. The server equips the executing device with an execution device function cascade that includes yN∘hN∘yN−1∘hN−1∘ . . . ∘y1, where y1, . . . , yNare function parameters (e.g., ED1(y1, . . . , yN)≡yN∘hN∘yN−1∘hN−1∘ . . . ∘y1), and provides the functions g1, . . . gNto the executing device. The executing device obtains the functions g1, . . . , gNand a processor for loading the execution device function cascade and applying the loaded execution device function cascade to the functions g1, . . . , gN(e.g., ED1(g1, . . . , gN)).

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