Re: Encryption on the AS/400

["Leif Svalgaard" <leif@xxxxxxxx>]

----- Original Message -----
From: Leif Svalgaard <leif@leif.org>
To: <midrange-l@midrange.com>
Sent: Wednesday, October 17, 2001 11:47 AM
Subject: Re: Encryption on the AS/400


> From: Nathan M. Andelin <nandelin@relational-data.com>
> > > If I simply wanted to encrypt data on my local machine
> > > I could knock up a program in about an hour that would
> > > give me 100% uncrackable encryption. Simply use a
> > > random key the same length as the data to be protected.
> > > XOR each byte of the message with the corresponding
> > > byte of the key.
> >
> > It seems to me that the hard part with this method is generating /
> > maintaining a truely random key that is the same length as your data.
What
> > if you need to encrypt large files?
> >
>
> work with 16 byte values.
> set x0 = some random seed value
> xor each block of 16 bytes with xi
> where xi = fractional part of a*log(xj)
> where j = i-1 and a is some (relatively) large value e.g. 1234.5678
>
> this gives you a pseudo-random number with no period
> (within the accuracy of 16 bytes).
>
>
>
>
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