Wow.  I would make two suggestions:

1) I would highly suggest that you look toward OWASP recommendations on
the subject of securing session management.
https://www.owasp.org/index.php/Session_Management

Additionally, I would point you to the first bold item here
https://www.owasp.org/index.php/Top_10_2007-Broken_Authentication_and_Session_Management

>   * *Only use the inbuilt session management mechanism.* Do not write
>     or use secondary session handlers under any circumstances.
>


2)  Solving the Diffie--Hellman key exchange problem eliminated the need
for men with handcuffed briefcases and embassy bags for shared secrets. 
I would suggest that you find a more modern way to handle your credentials.

On 9/13/2011 10:44 PM, Aleksey Tsalolikhin wrote:
> Hi, anybody here have experience using GRC.com's PPP?
>
> https://www.grc.com/ppp
>
> I've read up on this kind of system,
>
> http://en.wikipedia.org/wiki/Transaction_authentication_number
>
> and it seems like it would increase the security of a Web service as
> compared to just using a static password alone.
>
> The weak point I see immediately would be how you get the password
> sheet to the user in the first place... it'd have to be mailed I
> guess, to go out of band, for maximum security.
>
> Anyway, just curious if anyone has operational experience with it and
> is willing to share it.
>
> Thanks,
> Aleksey
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-- 
Ian Gorrie <[email protected]> Technology Advisor
CISSP-ISSAP CISA CISM CEH   http://gorrie.org
PGP Key: 0x88C367CD         http://www.linkedin.com/in/gorrie

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