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'DES (Data Encryption Standard)'
1998\06\22@175352 by Ariel Barreiro

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Hello everybody!

       I know there are some application of DES (Data Encryption Standard) with
some PIC's. I need any DES appilcation with any pic you have. BTW, If you
have other Encryption algorythm applied in any PIC, please see if you can
help me with that.

       Thank you very much

Ariel.

1998\06\23@064643 by Marco DI LEO

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Sorry, I don't have any DES code but if you need a fast (quite faster
than any DES implementation) and secure (128 bit key, no known attack to
the algorithm) you can get my TEA code at my page:
http://members.tripod.com/~mdileo/
You can find there the routine for the original TEA and for the security
improved TEA-N code.

Andy Warren has another implementation of the original TEA algorithm.
You can find the link to his page at my site.

Ciao
 Marco

Ariel Barreiro wrote:
>
> Hello everybody!
>
>         I know there are some application of DES (Data Encryption Standard) wi
th
> some PIC's. I need any DES appilcation with any pic you have. BTW, If you
> have other Encryption algorythm applied in any PIC, please see if you can
> help me with that.
>
>         Thank you very much
>
> Ariel.

1998\06\23@200800 by Andy Kunz

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>Sorry, I don't have any DES code but if you need a fast (quite faster
>than any DES implementation) and secure (128 bit key, no known attack to
>the algorithm) you can get my TEA code at my page:
>http://members.tripod.com/~mdileo/
>You can find there the routine for the original TEA and for the security
>improved TEA-N code.

Marco, did you ever get the bugs out of your implementation?

Andy (#5)


==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\06\23@232952 by Sean Breheny

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On Tue, 23 Jun 1998, Andy Kunz wrote:

> >Sorry, I don't have any DES code but if you need a fast (quite faster
> >than any DES implementation) and secure (128 bit key, no known attack to
> >the algorithm) you can get my TEA code at my page:
> >http://members.tripod.com/~mdileo/
> >You can find there the routine for the original TEA and for the security
> >improved TEA-N code.

Microchip app note AN583 covers implementing DES on a 17C42. I haven't
read it (or used it, of course) so I can't vouch for its accuracy! <G>

Sean

{Quote hidden}

1998\06\24@052222 by Marco DI LEO

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Andy,

I'm happy to say that my TEA crypto implementation _never_ had the bug
claimed here on the PICLIST.

If you get the past list messages (look for 14th-15th of May) you will
see how the debate between me and Andy Warren about the correctness of
my code was closed when I pointed out that the errors Andy was getting
were originated from a misconfiguration of his MPASM. He was simulating
using a 16C84 (36 byte of RAM) but the "original TEA" code uses _37_
bytes... Switching to the prescribed 16F84 showed the correctness of the
implementation.

I have also a TEA-N code that is safer, faster, uses even less RAM and
can run on the 16C84. For everyone willing to check the code, on my page
there is a file containing the test vectors to verify the TEA and TEA-N
implementations. Those vectors were computed using the reference
implementation (given on the paper introducing the algorithms) compiled
on a PowerPC UNIX platform.

I'm sorry for my bad net-english but I hope you get the meaning...

Ciao
 Marco

P.S. If someone is interested I've almost finished my pseudo random
number routines. The problem was the choice of an algorithm that is
secure (unpredictable) and fit in the PIC limited resources (there are
lot of methods that use some array of 17000 32-bit numbers but I guess
the 16F84 is not enough!)


Andy Kunz wrote:
{Quote hidden}

1998\06\24@053630 by Marco DI LEO

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Sean Breheny wrote:
>
> On Tue, 23 Jun 1998, Andy Kunz wrote:
>
> > >Sorry, I don't have any DES code but if you need a fast (quite faster
> > >than any DES implementation) and secure (128 bit key, no known attack to
> > >the algorithm) you can get my TEA code at my page:
> > >http://members.tripod.com/~mdileo/
> > >You can find there the routine for the original TEA and for the security
> > >improved TEA-N code.
>
> Microchip app note AN583 covers implementing DES on a 17C42. I haven't
> read it (or used it, of course) so I can't vouch for its accuracy! <G>
>
> Sean

I know, but if you live outside the U.S.A. they can't give you the code
because "strong" crypto is considered a weapon (even if DES is no longer
strong as it used to be). That's wy, on my page, I asked non-US citizen
to not download the code from the US-located provider I use and to
request the routines by email (I do not live in the U.S.A. so I am not
exporting anything from there).

>
> >
> > Marco, did you ever get the bugs out of your implementation?
> >
> > Andy (#5)

I just answerd at this qustion in another message.

Ciao
 Marco

1998\06\24@072247 by g.daniel.invent.design

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Marco DI LEO wrote:

> > Microchip app note AN583 covers implementing DES on a 17C42. I haven't
> > read it (or used it, of course) so I can't vouch for its accuracy! <G>
> >
> > Sean
>
> I know, but if you live outside the U.S.A. they can't give you the code
> because "strong" crypto is considered a weapon (even if DES is no longer
> strong as it used to be). That's wy, on my page, I asked non-US citizen
> to not download the code from the US-located provider I use and to
> request the routines by email (I do not live in the U.S.A. so I am not
> exporting anything from there).

Marco,
You might be interested to know that the USA have spy domes even in New
Zealand.  Suposedly this is to cover the Pacific region, however this
does not make us feel any more secure in New Zealand (located in the
Pacific region)  I rather suspect that their covert activities include
transmissions of other peoples "confidential" messages encrypted using
above DES methods.

Of course this is the "great American way" of aggressive strategy so
epitomised by Bill Gates.

Typically the best advertising is to provide blatant restrictions and
then to allow countervention of the restrictions under weak protest.   I
am not familiar with any common DES varieties, but because the USA
"apparently" protects USA local DES, does not necessesarily mean that it
is the ultimate standard.   I don't want to debate the validity of these
data encryption standards, but I can see the potential in this scenario
for mass acceptance of a product "supplied" under dubious circumstances
by a very aggressive country.

regards,
a reluctant MS user considering LINUX,
Graham Daniel

1998\06\24@084702 by Andy Kunz

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>my code was closed when I pointed out that the errors Andy was getting
>were originated from a misconfiguration of his MPASM. He was simulating
>using a 16C84 (36 byte of RAM) but the "original TEA" code uses _37_
>bytes... Switching to the prescribed 16F84 showed the correctness of the
>implementation.

I remember that now.  Sorry for the forgetfulness.

Andy


==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\06\24@141306 by Ariel Barreiro

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At 11:35 AM 6/24/98 +0200, you wrote:
{Quote hidden}

Marco,

       Due to the export rules of U.S. I haven't found the AN583 from Microchip
.
It's the DES Implementation of Microchip but they didn't distribute the
code. Do you know where I can get it? Perhaps you have it or something like
that. I have already been to your site. It's pretty intersting the TEA
Crypto, but I am would like to see the implementation of DES also.

Thank you.

Ariel.

1998\06\25@125333 by Marco DI LEO

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Ariel Barreiro wrote:
> Marco,
>
>         Due to the export rules of U.S. I haven't found the AN583 from Microch
ip.
> It's the DES Implementation of Microchip but they didn't distribute the
> code. Do you know where I can get it? Perhaps you have it or something like
> that. I have already been to your site. It's pretty intersting the TEA
> Crypto, but I am would like to see the implementation of DES also.
>
> Thank you.
>
> Ariel.

I'm sorry but I don't know of any available DES implementation for the
PIC.
Eric Smith has one on his page but the availability of his code is
limited by the same rules that block the Microchip implementation. I
don't know if someone outside the USA has the Eric code or a link to a
place to download from.
If you have some spare time you can try to get the source code of some
(PIC based) program used to decrypt the satellite transmission. The
crypto routine used in these devices should be somewhat similar to DES
(I never checked it but I read it somewhere). Do a search on infoseek
using "satellite PIC videocrypt".

If you find something please let me know. DES is not so strong but it
can be useful when you have to interface existing code or devices.

Ciao
 Marco

1998\06\26@175007 by tefan Ranguelov

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Hi !

Ariel Barreiro wrote:
>
> Hello everybody!
>
>         I know there are some application of DES (Data Encryption Standard) wi
th
> some PIC's. I need any DES appilcation with any pic you have.

There is an DES app. note on Microchip's WEB server, but you don't get
the code outside the USA and Canada due to export law.

Sombody mentioned on this list DES is implemented on the PIC cards for
descrambling european pay-tv chanels. I still haven't found the right
code
snipet but

http://www.cs.auc.dk/~rja/techuk.htm

seems to be a good starting point. After reading the FAQ i am not sure
if
it is real DES or a simlified variant without the S-boxes. If you find
the right subroutine in the descrambler binaries, please let me know ...

> BTW, If you
> have other Encryption algorythm applied in any PIC, please see if you can
> help me with that.
>

There are implementations of the Tiny Encription Algorithm on the WEB on
:

http://vader.brad.ac.uk/tea/tea.shtml

I have also implemented the encryption part of the RC5 algorithm and can
send it to
you via priv. e-mail.

St.

1998\06\28@005905 by Brian C. Lane

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On Wed, 24 Jun 1998, Stefan Ranguelov wrote:

> There are implementations of the Tiny Encription Algorithm on the WEB on
> :
>
> http://vader.brad.ac.uk/tea/tea.shtml
>
> I have also implemented the encryption part of the RC5 algorithm and can

 There is also a new algorithm from Bruce Scheiner, the author of Applied
Cryptography, called twofish. They have example code for micros with
limited ram resources. I haven't looked at the spec yet, but if its from
Bruse then you can be fairly confident of its security.

 The homepage is at http://www.counterpane.com

 Brian

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1998\06\28@203017 by Ariel Barreiro

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At 05:31 PM 6/24/98 +0200, you wrote:
Steve,

       I would like if you could send me the RC5 Algorythm by private email.
Thank you very much.

>Hi !
>
>Ariel Barreiro wrote:
>>
>> Hello everybody!
>>
>>         I know there are some application of DES (Data Encryption
Standard) with
{Quote hidden}


'DES (Data Encryption Standard)'
1998\09\14@234556 by Ariel Barreiro
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Dear anybody,

       I asked for this some time ago. I desesperatly need the application note
of microchip AN583 which is the one where DES is implmented on a PIC. But
due to the export regulations of the US they cannot give the source code of
the implmentation. As far as I know the regulations have been avoid and
they are allowed to give the code. Contacting microchip by e-mail is
impossible as I get always no answer. Calling them is also a bit difficult
becouse I am in Argentina and communications aren't quite cheap. If anyone
within the US could make me the favor and call microchip to ask them for
the code It would be really helpful for me. They cannot deny to distribute
it within the US.

       Also may be any other international reader of these mail has a microchip
sales distributor in his country and he may try to find it.

       This is very important for me. If anyone takes the time to make that pho
ne
call I will be forever thanked.

Ariel.

1998\09\15@013230 by Mark Willis

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The problem as I understand it is that any US resident can ask for and
receive it, but transmitting it outside of the US is considered bad by
the Government folks who make such decisions;  Encryption is considered
a "munition" for some dumb reason, by the US Govt...

 Now if someone outside the US already HAD the DES standard, they can't
say much about it, nu?

 PGP would be an equivalent tool;  Code that into a PIC, perhaps?

 Mark, .....mwillisKILLspamspam@spam@nwlink.com

Ariel Barreiro wrote:
>
> Dear anybody,
>
>         I asked for this some time ago. I desesperatly need the application no
te
{Quote hidden}

ip
> sales distributor in his country and he may try to find it.
>
>         This is very important for me. If anyone takes the time to make that p
hone
> call I will be forever thanked.
>
> Ariel.

1998\09\15@043355 by paulb

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Mark Willis wrote:

> The problem as I understand it is that any US resident can ask for and
> receive it, but transmitting it outside of the US is considered bad by
> the Government folks who make such decisions;  Encryption is
> considered a "munition" for some dumb reason, by the US Govt...

 PGP in all versions including the latest has been *legally* exported
from the US by the simple expedient of printing it on paper and
carrying (all explained on the PGP site).  Not sure whether this
includes mail though.  It appears munitions can exist on disk or e-mail,
but can't be printed on paper!

 But *why* would anyone want DES?, one has to ask!
--
 Cheers,
       Paul B.

1998\09\15@063909 by Mark Willis

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Paul B. Webster VK2BZC wrote:
>
> Mark Willis wrote:
>
> > The problem as I understand it is that any US resident can ask for and
> > receive it, but transmitting it outside of the US is considered bad by
> > the Government folks who make such decisions;  Encryption is
> > considered a "munition" for some dumb reason, by the US Govt...
>
>   PGP in all versions including the latest has been *legally* exported
> from the US by the simple expedient of printing it on paper and
> carrying (all explained on the PGP site).  Not sure whether this
> includes mail though.  It appears munitions can exist on disk or e-mail,
> but can't be printed on paper!
>
>   But *why* would anyone want DES?, one has to ask!
> --
>   Cheers,
>         Paul B.

 <Shakes head in continuing amazement, knowing that if HE carried that
paper through customs, it'd explode on him.>

 <G>  Mark

1998\09\15@065816 by g.daniel.invent.design

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Mark Willis wrote:
{Quote hidden}

Just be certain *NOT* to impregnate said 128 bit D.E.S. papers in
nitrogen
tri-iodide before carrying through customs.

(in such a case the printed paper would be hotter than Monica L. & Bill
C.)

p.s. I am not writing of the pic list Bill C.

Regards,
Graham Daniel.

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