Compression side channel

[Bill Stewart]

At 11:11 AM 09/10/2001 +1000, Greg Rose wrote:
>At 12:44 AM 9/9/2001 -0400, Sandy Harris wrote:
>>Does using non-adaptive compression save the day?
>
>Huffman coding using a fixed code table is not a bad way to go. You can 
>even peek at the characteristics of the input and choose a table based on 
>that... having standardised tables for English text, intel machine code, 
>MS-word documents, C code, other languages, etc. Fax machines do something 
>like this, with a huffman code table conditioned on a set of standard 
>documents, but I'm not sure whether it is just a single table or a set of 
>"choose one of these".

G3 is a single table - it's the standard used for most fax machines,
with 100x200 or 200x200 resolution.
Not sure about G4, which has higher resolution,
but I think that's the case for it also.





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