Re: How fast is DES?

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Article #3141

#3141

From: Bruce Schneier
Date: Tue, 12 Jan 1993 05:54

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In article <TODD.93Jan11151650@palomar.tivoli.com> todd@palomar.tivoli.com writes:
>
>In <1494@eouk9.eoe.co.uk>, Andrew Haley (ahaley@eoe.co.uk) writes
>
>> Another possibility is using a hash function such as MD4 as a stream
>> cipher generator.  One advantage of using stream ciphers is that the
>> stream can be generated offline, so that when you want to transmit a
>> message it can be done instantly.  The total processing time to
>> encrypt will not be any less, but the stream can be generated while
>> the processor would otherwise be idle, effectively reducing the
>> encryption overhead to zero.
>
>I'm not sure how practical this technique is, I believe that IBM owns
>a patent on it.  And it won't be expiring for even further in the
>future than the RSA patents!!!
>
Does anyone know if this is true or not?  If it is true, does anyone have
a patent number?

Bruce

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References: <TODD.93Jan11151650@palomar.tivoli.com>

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From: schneier@chinet.chi.il.us (Bruce Schneier)
Subject: Re: How fast is DES?
Message-ID: <C0q8EH.1zn@chinet.chi.il.us>
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References: <TODD.93Jan11151650@palomar.tivoli.com>
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Date: Tue, 12 Jan 1993 05:54:17 GMT
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