On 09/22/2011 11:20 AM, Frank M. Ramaekers wrote:
> (something like ARC4)?
That would be straightforward, given a way to reblock one stream with
the length of records on another. Just seed RANDOM with your key, and
COMBINE XOR to encode or decode.
So what's a simple way to reblock the output of RANDOM to match the
length of the input records?
Failing that, I suppose if you don't mind reblocking the input you could
do it that way instead. You'd need to block it in single bytes to avoid
junk bytes at the end--and, actually, that also avoids delaying the
record, in case this is mixed with other data. To encode:
(end /) ... | block 1 cms4 | xor: combine stop anyeof xor | ...
/ random * ... | fblock 1 | xor:
To decode:
(end /) ... | xor: combine stop anyeof xor | deblock cms4 | ...
/ random * ... | fblock 1 | xor:
¬R
