🚀 go-pugleaf

In article <1ejpp5INNdef@roche.csl.sri.com> boucher@csl.sri.com (Peter K. Boucher) writes:
>1) It generates a stream of pseudo-random numbers, based on a pass-phrase
>   typed by the user (between 13 and 1019 characters).  The first 
>   ~million bytes of pseudo-random numbers are generated when the program
>   starts up.  Call it "key_stream."
>
>2) A separate, single pseudo-random byte is also generated at the start.
>   It's value depends on generating the entire initial key_stream.  Call
>   it "zipper."
>
>3) the program executes a loop containing the following (pseudocode)
>   to encrypt a file:
>	inchar = getchar(infile)
>	outchar = inchar ^ key_stream[counter] ^ zipper  <-- "^" means xor
>	counter = counter + 1
>	zipper = outchar
>	putchar(outfile, outchar)

I don't see thay your "zipper" does anything but help protect the
first byte:
	outchar[2] = inchar[2] ^ key_stream[2] ^ outchar[1]
where outchar[1] is sitting right there in front of the cryptanalyst.

So the whole thing depends on how strong your keystream generator is.

		--Ken Pizzini