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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.

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

`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`

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

[KC95].

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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