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Kao Chow Authentication v.3

Author(s): I Long Kao and Randy Chow  (1995)

Summary: Key distribution and authentication protocol. Symmetric keys cryptography with server.

Remark

This protocol is an extension of Kao Chow Authentication v.2 to encompass tickets.

Protocol specification (in common syntax)

A, B, S :   principal
Na, Nb :   number
Kab, Kbs, Kas :   key

1.   A -> S :   A, B, Na
2.   S -> B :   {A, B, Na, Kab, Kt}Kas, {A, B, Na, Kab, Kt}Kbs
3.   B -> A :   {A, B, Na, Kab, Kt}Kas, {Na, Kab}Kt, Nb, {A, B, Ta, Kab}Kbs
4.   A -> B :   {Nb, Kab}Kt, {A, B, Ta, Kab}Kbs

Description of the protocol rules

In message 3, B generates a new ticket {A, B, Ta, Kab}Kbs containing Kab and a timestamp Ta.

Requirements

See Kao Chow Authentication v.1.

References

[KC95].

See also

Kao Chow Authentication v.1, Kao Chow Authentication v.2, Needham Schroeder Symmetric Key, Neumann Stubblebine.

Citations

[KC95]
I Lung Kao and Randy Chow. An efficient and secure authentication protocol using uncertified keys. Operating Systems Review, 29(3):14--21, 1995.
last modified 11/11/2002.
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