Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-06-02
1996-08-06
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 23, 380 25, 380 30, 380 46, H04K 100
Patent
active
055442455
ABSTRACT:
The network and each user i share an encryption algorithm EK.sub.i () using his authentication key K.sub.i as a cipher key, its inverse function EK.sub.i.sup.-1 (), a specific function F() and its inverse function F.sup.-1 (), and a function G(). The network calculates C.sub.1 =EK.sub.i (F(r.sub.n, r.sub.u)), using a random number r.sub.n generated by the user and a random number by the network, and sends it to the user. The user calculates (d.sub.1, d.sub.2)=F.sup.-1 (EK.sub.i.sup.-1 (C.sub.1)) and, if d.sub.1 =r.sub.n, judges the network to be an authorized one. The user generates a random number r.sub.c and sends C.sub.2 =EK.sub.i (F(d.sub.2, r.sub.c)) to the network. The network calculates (d.sub.3, d.sub.4)=F.sup.-1 (EK.sub.i.sup.-1 (C.sub.2)) and, if d.sub.3 =r.sub.u, judges the user to be an authorized one.
REFERENCES:
patent: 5245506 (1994-09-01), Tsubakiyama et al.
patent: 5390245 (1995-02-01), Dent et al.
Cain David C.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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