Enciphering and deciphering apparatus, and enciphering and...

Details Enciphering and deciphering apparatus, and enciphering and... Enciphering and deciphering apparatus, and enciphering and...

2008-01-08

2008-01-08

Vu, Kim (Department: 2135)

Cryptography

Particular algorithmic function encoding

C380S029000, C380S030000, C708S490000, C708S491000, C708S492000

Reexamination Certificate

active

07317794

ABSTRACT:
The present invention aims at providing a novel enciphering and deciphering apparatus and an enciphering and deciphering method related thereto, which are respectively capable of contracting the time required for enciphering and deciphering processes and decreasing the number of logic gates provided in the apparatus. Essentially based on an equation Xki=1+Σ((J=1, i)iCj·Xk−1j) and also based on an initial value consisting of a group of power raising values Xk0jcorresponding to j=1 through m in relation to k−1=k0, an arithmetic operating unit 21 seeks a second expression Yk1by serially computing a group of power raising values Xkicorresponding to i=1 through m in relation to one unit of k shown in the above equation in a range from k=k0+1 up to k=k1 by applying binomial coefficients stored in a coefficient memory unit17. Accordingly, once those binomial coefficients corresponding to predetermined integers n and m are stored in memory, thenceforth, it is possible to contract the time required for executing an enciphering or deciphering process related to identical integers n and m.

REFERENCES:
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patent: 6430588 (2002-08-01), Kobayashi et al.
patent: 7069287 (2006-06-01), Paar et al.
patent: 7088821 (2006-08-01), Shaik

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