Telegraphy – Systems – Printing
Patent
1982-07-14
1985-04-30
Cangialosi, Sal
Telegraphy
Systems
Printing
178 2214, H04L 904
Patent
active
045145920
ABSTRACT:
A cryptosystem for the RSA cryptography which calculates C.ident.M.sup.e mod n and, for this calculation, performs an operation C=M.sub.1 .times.M.sub.2 mod n. An operation ##EQU1## is performed in the order j=l, l-1, . . . 1 to obtain last R.sub.1 as the result of the calculation M.sub.1 .times.M.sub.2 mod n. The calculation ##EQU2## is performed in a quotient calculating unit, and the calculation M.sub.1 .times.M.sub.2,j '+2.sup..lambda. R.sub.j+1 -Q.sub.j .multidot.n is performed in a main adding unit. Where, variable R.sub.j may be divided into two parts R.sub.j,0 and R.sub.j,1. In this way, the multiplication and the division are simultaneously conducted, thereby to raise the calculation speed.
REFERENCES:
patent: 4200770 (1980-04-01), Hellman et al.
patent: 4351982 (1982-09-01), Miller et al.
patent: 4405829 (1983-09-01), Rivest et al.
Cangialosi Sal
Nippon Telegraph & Telephone Public Corporation
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