Re: Re-3: Encrypting a Filename

Well, I _did_ write it was a simple solution, didn't I? ;-)

I like tye's suggestion, although increasing file name might mean exceeding filesystem's name length limit... Hmm... perhaps good ol' enigma?

-mk

Comment on Re: Re-3: Encrypting a Filename

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Re-5: Encrypting a Filename by John M. Dlugosz (Monsignor) on Jun 15, 2001 at 03:32 UTC
I was just thinking on the drive home that I could implement the Vigenère cypher as a CUFP as a companion to your post. I also figured out how to use a stream cypher: treat the legal character set as a wheel, and use the output of a pseudorandom sequence (as set up initially with your key) as a count to shift the wheel. So even though the sequence produces numbers in the range 0..255, I can map that using modulo addition. That doesn't 'feedback' though, so I need to throw the current character into the sequence generator as it's encoded. I also wonder if RC4 can be trivially adapted to use an arbitrary sized alphabet. Using Enigma, generalized to any alphabet, is just plain cool, too! —John	[reply]

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Re-5: Encrypting a Filename
by John M. Dlugosz (Monsignor) on Jun 15, 2001 at 03:32 UTC

I also figured out how to use a stream cypher: treat the legal character set as a wheel, and use the output of a pseudorandom sequence (as set up initially with your key) as a count to shift the wheel. So even though the sequence produces numbers in the range 0..255, I can map that using modulo addition. That doesn't 'feedback' though, so I need to throw the current character into the sequence generator as it's encoded.

I also wonder if RC4 can be trivially adapted to use an arbitrary sized alphabet.

Using Enigma, generalized to any alphabet, is just plain cool, too!

—John

[reply]