[En-Nut-Discussion] scp sftp or ssh for Ethernut (1.3 Board)

[Ralph Mason]

I found that TEA works well on a AVR. For distributing keys you can use 
RSA give your server a private key, and then encrypt a 128 bit session 
key with the public key during programing of each device.  (A different 
one for each device clearly!)

Then you device can tell the server it's session key, use TEA (or other 
for the session) and there is no problem keeping hold of lists of them.

Ralph


> Dear Vesa,
> Thank you for your quick response.
>
> I found sources for BLOWFISH at 
> http://www.schneier.com/blowfish-download.html
> So i can encrypt the data before sending with ftp.
>
> Does anyone have a hint, where to find sources or information,
> if i want to do it with "predistributed keys" ?
>
> rgdßs roland
>
>
>   
>> --- Ursprüngliche Nachricht ---
>> Von: Clemens Kirchgatterer <c.kirchgatterer at amatic.com>
>> An: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
>> Betreff: Re: [En-Nut-Discussion] scp sftp or ssh for Ethernut (1.3 Board)
>> Datum: Thu, 1 Dec 2005 11:51:41 +0100
>>
>> Vesa Jääskeläinen <chaac at nic.fi> wrote:
>>
>>     
>>> r.j.pieper at gmx.net wrote:
>>>       
>>>> Hello Everyone,
>>>>
>>>> does anybody know how to implement or where to find code for scp,
>>>> sftp or ssh?
>>>>
>>>> Any help or hints are welcome.
>>>>         
>>> That might be a quite a job to implement those yourself ;), but you
>>> can use OpenSSH as a reference:
>>>       
>> i think performance wise, this is not feasable. all that bignum
>> operations in rsa are just too cpu hungry.  i would go for
>> predistributed keys and blowfish.
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>>
>>     
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