Re: SKey one-time password generation

From: megan (zhongmeiyi_at_yahoo.com.sg)
Date: 04/28/03 

Date: Mon, 28 Apr 2003 21:09:22 +0800

Oops, sorry for that horrid diagram.

"megan" <zhongmeiyi@yahoo.com.sg> wrote in message
news:57257a88.0304271632.47119086@posting.google.com...
> Hi all, below is a diagram from what i understand on SKey one-time
> password generation. I'll be grateful if anyone can give any comments
> or feedback. In my opinion, diagrams helps to explain things clearly,
> but I couldn't find any diagrams on Skey OTP on the web. I couldn't
> paste a jpg picture so i can only draw it out simply. Hopefully it's
> clear enough. Thanks!
>
> -------------------->|SHF|---->OTP(x)
> | ^
> | |
> |------------>|SHF|--->OTP(x-1)
> | : : :
> | : : :
> | : : :
> | ^
> | |
> |------------>|SHF|--->OTP(2)
> | ^
> | |
> |---->|SHF|--->OTP(1)
> | ^
> | |
>seed passphrase
>
> where,
> SHF = Secure Hash Function
> OTP(1) != OTP(2) != ... != OTP(x-1) != OTP(x)
>
> The first one-time password to be used is produced by passing the seed
> and user&#8217;s passphrase through the secure hash function a number
> of times (x) specified by the user. The next one-time password to be
> used is generated by passing S though the secure hash function x-1
> times.
>
> Megan.