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Re^3: strings to number and XOR

by Anonymous Monk
on Oct 07, 2009 at 17:01 UTC ( #799761=note: print w/replies, xml ) Need Help??


in reply to Re^2: strings to number and XOR
in thread strings to number and XOR

I think I solved this. I just added 1 more, since an extra byte or two in the key doesn't hurt anything.
$key = "\x4f\xcb" x ((length($msg)/2)+1);
Aaron

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Re^4: strings to number and XOR
by almut (Canon) on Oct 07, 2009 at 17:20 UTC
    an extra byte or two in the key doesn't hurt anything

    It's maybe worth trimming your XORed string to the original length, or else half of your key pattern might leak... (to anyone who makes an educated guess about the procedure)

    t h i s i s a t e s t m e s s a g e z 74 68 69 73 20 69 73 20 61 20 74 65 73 74 20 6d 65 73 73 61 67 65 7a 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f cb 4f c +b 3b a3 26 b8 6f a2 3c eb 2e eb 3b ae 3c bf 6f a6 2a b8 3c aa 28 ae 35 c +b ^ +^

    ... just in case you do want to keep it secret (I don't really know what you intent to use this for).

    (OTOH, if encryption was the idea, and security was of any relevance, I'd choose a different approach anyway :)

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[davido]: Using the -i switch causes Perl to rename the input file, read from it, and write to a file using the original file's name. If there's an extension provided, as in -i.bak, it's easy to see where the input file is. Where is the input file temporarily....
[davido]: placed if there is no extension provided to the -i switch?
[davido]: Nevermind, found the answer.
[davido]: If no extension is supplied, and your system supports it, the original file is kept open without a name while the output is redirected to a new file with the original filename. When perl exits, cleanly or not, the original file is unlinked.
[haukex]: doc says "If no extension is supplied, and your system supports it, the original file is kept open without a name ..."

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