>> I know I would like to avoid "securty by obscurity", in other words
>> I'd like it to be difficult to crack the code even if the attacker
>> understands the encryption mechanism. However, I am not at all sure
>> where to begin. The only good news is, I have plenty of time to do
>> the research. :)
> 
> Having just done a university unit that included error correcting codes, I 
> get the impression that one could use an error correcting code to obfusicate 
> the downloadable data.

Which is exactly *not* what is asked for. Obfuscating works - if at all 
- only when the opponent does not know the algorithm.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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