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Hey!; New User Intro
Topic Started: Dec 7 2006, 09:58 PM (596 Views)
jdege Dec 7 2006, 09:58 PM Post #1
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 Howdy, folks :'D

I'm a new user.

Like many of you, I expect, I read John Peterson's "Codes and Secret Messages" as a kid. And it got me hooked.

My high school was high tech - we had programming classes, in Dartmouth BASIC, using DEC TTY 10s and 110-baud acoustic coupled modems. For extra credit, I wrote a program that implemented a brand new encryption algorthim of my own invention that was guaranteed unbreakable :lol:

In other words, I, too, re-invented a Vigenere. I thought was being terribly clever, using multiple keywords of differing length, but that's just Vernam's two-tape cipher.

I took a long keyphrase, broke it down into five subkeys of lengths 5, 7, 11, and 13, and applied each separately, adding to the plaintext mod-26. Just the usual sort of reinventing the wheel that we've all of us done.

In any case, I'm messing about with ciphers, again. (I was tasked with changing an old app to that it no longer stored plaintext passwords in the database. Boss said "do something simple, so that it looks like it's encrypted. So I wrote something that combined XOR encryption with 64k passes through a cryptographically secure hash routine. Simple ^_^ )

In any case, it got me thinking about ciphers, again, and I've been reading up on it in more detail than I had, before. (Finally read Kahn!) I'm playing around with writing crypto software, again. Designing routines for calculating kappa, phi, incidence of coincedence, dreaming about shotgun, annealing, genetic algotithm approaches to breaking the various common encryptions, etc.

And browsing the web.

Which brought me here...

Howdy!
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
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Donald Dec 7 2006, 10:20 PM Post #2
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 Hello and welcome to the crypto forum! Good to have another crypto buff here!

Quote:
 
John Peterson's "Codes and Secret Messages"

Yep, that was one of the books that got me started as well! :)
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Revelation Dec 23 2006, 03:29 PM Post #3
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 Sorry for my late reaction, this topic wasn't registered as a new topic.

Welcome to the forum :)
RRRREJMEEEEEPVKLWENFNVJKEEEEEAOLKAFKLXCFZAASDJXZTTTTTTTLSIOWJXMOKLAFJNNKFNXN
RAGRBAQEMHIGDJVDSEOXVIYCELFHWLELJFIENXLRATALSJFSLCYTKLASJDKMHGOVOKAJDNMNUITN
RRRRLJVEEEEECLYVYHNVPFTAEEEEEMWLMEIRNGLARWJAKJDFLWNTIERJMIPQWOTZEOCXKNUBNXCN
RJIRPOWEANFUSNCZVDVZNMSFEKLOEPZLDKDJWSAAAAAAAOERHJCTNCKFRIMVKSOFOMKMANREWNBN
RZUDRGXEEEEENFQIDVLQNCKNEEEEEDGLLLLLLAWIOSNCDARLODMTOEJXMILDFJROTKJSDNLVCZNN
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insecure Jan 11 2007, 12:44 PM Post #4
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 I shudder to think of my first attempt to disguise plaintext passwords in a database. Because it's just possible that that system is still live, I'm not going to describe what I did. Suffice to say that I didn't know spit about crypto at the time. Cracking it would be a one-banana problem.

btw As you probably noticed, I've not been around for a while. Sorry, but life gets in the way sometimes. Too many things to do, chasing too little time.
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Donald Jan 11 2007, 12:54 PM Post #5
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Quote:
 
btw As you probably noticed, I've not been around for a while. Sorry, but life gets in the way sometimes. Too many things to do, chasing too little time.

Heh. They've been, literally, working me round the clock. I just haven't had time to do any challenges or anything. So I understand! :)
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jdege Jan 11 2007, 07:07 PM Post #6
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insecure
Jan 11 2007, 12:44 PM
I shudder to think of my first attempt to disguise plaintext passwords in a database.

Code:
 

   int i=0;
   while (*p)
       *q++ = *p++ ^ "\xDE\xAD\xBE\xEF"[i++%4];
   *q = '\0';
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
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Revelation Jan 16 2007, 04:10 PM Post #7
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 Somehow the autopromote system is not working... but I did succeed in making you a Member (again) jdege :)
RRRREJMEEEEEPVKLWENFNVJKEEEEEAOLKAFKLXCFZAASDJXZTTTTTTTLSIOWJXMOKLAFJNNKFNXN
RAGRBAQEMHIGDJVDSEOXVIYCELFHWLELJFIENXLRATALSJFSLCYTKLASJDKMHGOVOKAJDNMNUITN
RRRRLJVEEEEECLYVYHNVPFTAEEEEEMWLMEIRNGLARWJAKJDFLWNTIERJMIPQWOTZEOCXKNUBNXCN
RJIRPOWEANFUSNCZVDVZNMSFEKLOEPZLDKDJWSAAAAAAAOERHJCTNCKFRIMVKSOFOMKMANREWNBN
RZUDRGXEEEEENFQIDVLQNCKNEEEEEDGLLLLLLAWIOSNCDARLODMTOEJXMILDFJROTKJSDNLVCZNN
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jdege Jan 16 2007, 07:34 PM Post #8
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Revelation
Jan 16 2007, 04:10 PM
Somehow the autopromote system is not working... but I did succeed in making you a Member (again) jdege :)

Does that mean you'd succeeded in making me a non-member, first?
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
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Revelation Jan 16 2007, 07:36 PM Post #9
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 No, I had no other choice than to make you (and all the other current members) a 'New Member', which is a group that cannot post.
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RAGRBAQEMHIGDJVDSEOXVIYCELFHWLELJFIENXLRATALSJFSLCYTKLASJDKMHGOVOKAJDNMNUITN
RRRRLJVEEEEECLYVYHNVPFTAEEEEEMWLMEIRNGLARWJAKJDFLWNTIERJMIPQWOTZEOCXKNUBNXCN
RJIRPOWEANFUSNCZVDVZNMSFEKLOEPZLDKDJWSAAAAAAAOERHJCTNCKFRIMVKSOFOMKMANREWNBN
RZUDRGXEEEEENFQIDVLQNCKNEEEEEDGLLLLLLAWIOSNCDARLODMTOEJXMILDFJROTKJSDNLVCZNN
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