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  • Subject: Re: Fw: Rewarding challenge AS/400...
  • From: Jim Langston <jlangston@xxxxxxxxxxxxxxxx>
  • Date: Thu, 16 Sep 1999 12:48:32 -0700
  • Organization: Conex Global Logistics Services, Inc.

Actually, the password system limiting values are used in the change program,
before it encrypts the value.

You can set a password to anything, even a disallowed one, by using CHGUSRPRF
and setting the password to whatever you want.

But, using the PASSWORD function it checks the system values for
what your password can and can not be.  It obviously does this before
it encrypts the password.

Regards,

Jim Langston

Phil Hall wrote:

> Just to put some peoples minds at rest, according to IBM, the password
> encryption on the AS/400 is one way only. There is **NO** API or program
> supplied that will decrypt the passwords on the AS/400. All password
> comparison (i.e. when you sign on, or use the profile APIs) is made between
> encrypted versions of the passwords. They also state that no un-encrypted
> versions of the password is stored on the machine.
>
> This doesn't stop a brute force attack.
>
> Now to put the cat among the pigeons, if this is true, then surely the
> method of encryption cannot be that strong, as otherwise the code to allow
> the implementation of the password limiting system values would be
> impossible...?
>
> --phil
>
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