Re: Re: Obscure data

[sweetblood]

I'm not sure what rot13 is but it sounds deliciously morbid.(g) Can you elaborate? I've done no encryption previously and have a very minimal degree of knowledge in the area.I have however learned from being here to take your suggestions seriously.

Thanks!

[Anonymous Monk]

It's dumb. It's something like

perl -le'$_=shift;s/(.)/chr( 13 + ord $1)/ge;print' abcdef
nopqrs


--- [from jargon] ---
rot13 /rot ther'teen/ n.,v. [Usenet: from `rotate alphabet 13 places']
   The simple Caesar-cypher encryption that replaces each English lett
+er
   with the one 13 places forward or back along the alphabet, so that 
+"The
   butler did it!" becomes "Gur ohgyre qvq vg!" Most Usenet news readi
+ng
   and posting programs include a rot13 feature. It is used to enclose
+ the
   text in a sealed wrapper that the reader must choose to open -- e.g
+.,
   for posting things that might offend some readers, or {spoiler}s. A
   major advantage of rot13 over rot(N) for other N is that it is
   self-inverse, so the same code can be used for encoding and decodin
+g.
   See also {spoiler space}, which has partly displaced rot13 since
   non-Unix-based newsreaders became common.

[l2kashe]

rot13 == add 13 to the value of a character.

I've only ever used it on alpha type data streams, but I assume you could do something similar on numbers as well. Simple rot13 key gen below. The value in the top row becomes the value in the bottom row, and vice versa

$f = 'a';

for ( 0 .. 25 ) {
   print "$f ";
   print "\n" if $_ == 12;
   $f++;
}
print "\n";

[Abigail-II]

y!a-zA-Z!n-za-mN-ZA-M!

Abigail

[sweetblood]

Ok, I see what you mean. This is not a bad approach except for the numeric data. I suppose I could convert every byte to it's ascii code value and then add 13, but this could get more complicated than I'd like. I'm trying to keep it simple, which is not always easy for me.

Thanks!

[Abigail-II]

For numbers, use rot5:

y!a-zA-Z0-9!n-za-mN-ZA-M5-90-4!

Or go wild and do something like:

y!a-zA-Z0-9!n-zA-Z0-9a-m!

Abigail