Implementing OTP mechanism with existing kerberos

[Tim Alsop]

Gopal,

It is not easy, but once it is done you get a nice solution - see below
:
 

-----Original Message-----
From: kerberos-bounces at mit.edu [mailto:kerberos-bounces at mit.edu] On
Behalf Of Gopal Paliwal
Sent: 25 July 2007 21:31
To: kerberos at mit.edu
Subject: Implementing OTP mechanism with existing kerberos

Hi,

I am implementing OTP mechanism in the existing kerberos.
I have set up pre-auth mechanism to authenticate the clients.
Now, the user will be asked password+OTP instead of just password. i
will be
generating this OTP with a hardware token.

Also, i will be encrypting time-stamp with password & OTP.
At the kerberos authentication server, I will be able to generate a OTP.

Now, the problem which I will face is that kerberos doesn't store
passwords
in clear form. & I somehow need to form a key at kerberos authentication
server side to decrypt the time-stamp sent in the AS_REQ message by
user.
That key will be made up of OTP + password.
Can someone point me out the mechanism as to how can I obtain password
in
clear form or other way with which I will be able to resolve my doubt.

-gopal
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