Joel,
I got it. 
That's exactly what I was looking for.
The impossibility of getting back what was
passed to checksum makes it ideal for login routines
Thanks
Carlos

Em Ter 21 Out 2003 17:11, Joel Neely escreveu:
> Hi, Carlos,
>
> You can't.  See below.
>
> Carlos Lorenz wrote:
> > Considering the following code, how can I get
> >
> > :pwd back in plain English?
> > :
> >>>write %password.txt checksum/secure pwd
> >>>
> >>>
> >>>pwd: read %password.txt
> >
> > == "�'�FJ�$6�&�[/^Q�8^[&"
>
> Check the help for CHECKSUM:
>    >> ? checksum
>
>    USAGE:
>        CHECKSUM data /tcp /secure /hash size /method word /key key-value
>
>    DESCRIPTION:
>         Returns a CRC or other type of checksum.
>         CHECKSUM is a native value.
>
>    ARGUMENTS:
>         data -- Data to checksum (Type: any-string)
>
>    REFINEMENTS:
>         /tcp -- Returns an Internet TCP 16-bit checksum.
>         /secure -- Returns a cryptographically secure checksum.
>         /hash -- Returns a hash value
>             size -- Size of the hash table (Type: integer)
>         /method -- Method to use
>             word -- Method (Type: word)
>         /key -- Returns keyed HMAC value
>             key-value -- Key to use (Type: any-string)
>
> The description "cryptographically secure" means that it is intended
> to be  difficult to reverse the computation.
>
> -jn-
>
> --
> ----------------------------------------------------------------------
> Joel Neely            joelDOTneelyATfedexDOTcom           901-263-4446
>
> Enron Accountingg in a Nutshell: 1c=$0.01=($0.10)**2=(10c)**2=100c=$1


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