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Re: SMS Encryption

From: Marco Manyevere
Subject: Re: SMS Encryption
Date: Mon, 6 May 2002 11:21:47 +0200

The codebook approach sounds good enough for me, I can even maintain a large
database of the same keys and pick them at random and then include the key
to the key in the SMS message. My messages do not have the same lengths -
how does this affect me? Second but most important - does the XOR guarantee
printable ASCII output?



----- Original Message -----
From: "Pawel Kot" <address@hidden>
To: <address@hidden>
Sent: Sunday, May 05, 2002 9:22 PM
Subject: Re: SMS Encryption

> On Fri, 3 May 2002, Marco Manyevere wrote:
> > I'm working on a client/server application that communicates financial
> > transactional information using SMS messages. Does anyone know how to
> > encrypt/decrypt SMS messages producing only printable ASCII characters
> > without increasing the message size? Alternatively, what I can use is a
> > checksum attached to the clear text message that guarantees me that the
> > message and the checksum have not been modified in transit. Does anyone
> > some ideas?
> Do your messages have the equal length? And how secure do you wish to be?
> You can create some codebook and store there keys with a length equal to
> the message length for each client. Then just XOR the message with a key.
> The client would need to use the next key from the own list to be able to
> decode. Old keys cannot be used anymore. The keys should be random.
> Just a first thought.
> pkot
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