Cipher Wheel 1

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http://www.instructables.com/id/Cipher-Device/

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Cipher Deviceby blogith on November 20, 2006

Table of Contents

Cipher Device ................................................................................................................

Intro: Cipher Device ........................................................................................................

Step 1: Materials ...........................................................................................................

Step 2: DVD case ..........................................................................................................

Step 3: Tools ..............................................................................................................

Step 4: Divisions ...........................................................................................................

Step 5: More Lines .........................................................................................................

Step 6: Divide small Cd ......................................................................................................

Step 7: Characters .........................................................................................................

Step 8: Put in DVD case .....................................................................................................

Step 9: Complete ..........................................................................................................

Related Instructables ........................................................................................................

Comments ................................................................................................................
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Intro: Cipher DeviceThis is how to make a homemade Cipher Device for fun by recycling used or damaged cds. I did this fast but you can get more creative and make it a bit more compleor even more durable using stickers and other materials found at home.


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Step 1:MaterialsFirst find cds you dont need or that don't work. One large one small.

Step 2:DVD caseThen Find a dvd case you don't need or are tossing.


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Step 3:ToolsYou will need a marker and a ruler. With these make lines dividing up the cds. You can make it so that you get 16 divisions or more depending on how you want to mait using more of the alphabet. You can be neater about it then I was. Again I was rushing.

Step 4:DivisionsMake the divisions. I think I already mentioned that. Ok but here is an idea of how to do this.

Step 5:More LinesMore lines. Again you can do this way neater or use a cd label thingy.


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Step 6:Divide small CdYou want to make sure both cds are divided up.

Step 7:CharactersNow you can add the alphabet or numbers or whatever you want to use.

Step 8:Put in DVD casePlace the cds in the dvd case with the smaller cd on the outside. Make sure the letters are facing you.


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Step 9:CompleteComplete cipher by creating a key or rule for use. Thats it thats how you make a homemade Cipher Device.

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Comments

14 comments Add Comment

nutsandbolts_64 says: May 20, 2010. 4:25 AM REPThis is awkward! I was gonna make something like that with no knowledge whatsoever it already existed...

xxycm says: Mar 8, 2009. 12:16 AM REPGreat idea just what I was looking for, my grandson is 8 and I am sure we will have some learning going on with the fun, plus grandma here has an idea fosome grown-ups too. Will be referring others to check it out.

paulomichael says: Nov 5, 2008. 4:42 PM REPIt's also very nice to use with the Vigenere cipher! It's based on the Caesar cipher but depending on the size of the key, it may be nearly impossible to cracTake a look at the Vigenere cipher

alvincredible says: Jan 29, 2008. 6:13 PM REPi made something like this some day long long ago in a galaxy far far away, but it was for guitar chords and such. insteada of a smaller cd (becuase i couldfind one) i just used those clear cd things that come in the pack. it was pretty cool, but i think this one mihgt be better becuase ...i dont know :-)


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crestind says: Nov 25, 2006. 10:35 PM REPI don't think I would ever get around to using it, but it looks cool! Reminds me of the cryptex from DaVinci Code.

gfixler says: Nov 23, 2006. 6:00 AM REPWhen I saw the pic in the Make blog, my mind raced: "How did they cut the CD into an inner and outer ring that could nest so beautifully? They must haveused two CDs, one to make the smaller, and one to make the outer, but still, cutting those things is no easy task. I bet they used a mill. Or a lathe!" Thatwould be pretty cool. I was picturing other homebrew methods, with CDs clamped onto drills, mounted to tables, holding X-actos just so, fake-lathing awaythe outer part of the inner disc, and the inner part of the outer disc. Then I see it's a large and small CD. Haha! I have a box of like 200 of those mini CDs,too, which are always too small by usually ~10MB to ever be useful. I love how it never even occurred to me to just use one of those as the smaller wheel.When will I learn to just KISS? Well done - thanks for sharing.

cry_wolf says: Nov 21, 2006. 3:59 PM REPWow, i like that alot, really slick and clean. Nice job!

blogith says: Nov 21, 2006. 12:24 PM REPThanks for the comments. It's really just a cheap but easy to make Cipher Device similar to the Pletts Device. There are many ways to make it fancier ormore complex. Maybe adding a way to spin it randomly or cutting out a notch on the outside of the dvd case to expose the letters selected.

_soapy_says: Nov 21, 2006. 11:05 AM REPThis is a weak encryption, called the "Caesar shift cypher", if you simply use an offset of, say, lining A up with E. If you want more (still not much) security,you can write the letters in a random order, then make a second wheel that is identical. For the best security (short of getting another wheel or changing thdesign) you should randomise the alphabet, then change where the A is after each letter is encoded. Use a common rule, then you will be able to encryptand decrypt in sync. One possible rule is, start with the A over the 5th letter, then advance CW by 5 each time while encrypting. If the decoder repeats thisthey will be able to decode it. A better variant could use the message itself to change the encryption. Advance CW by the position of the letter encryptedeach time. To decrypt, tell the person the last letter used, and then they advance CCW as they go, starting from the other end of the transmission.

irwinner says: Nov 20, 2006. 11:59 PM REPwhat does it do?

Krikit1337 says: Nov 21, 2006. 7:30 AM REPBy rotating the inner wheel to match up with the outer wheel in various ways, you can substitute letter/numbers from the inner wheel for the letter on theouter wheel. In the last picture shown, for example, you could show a letter 'G' as either '8' or 'H'. I agree with matthewtoldme, however, randomizing thletter order on the inner/outer wheel would make for a more useful cipher than simply shifting.

CementTruck says: Nov 21, 2006. 10:55 AM REPThis is basically a decoder ring. Cool idea.

http://www.exploratorium.edu/ronh/secret/secret.html

http://en.wikipedia.org/wiki/Secret_decoder_ring

pattern86 says: Nov 20, 2006. 11:19 PM REPwriting either the outer or the inner characters in a randomized order might be helpful
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Cipher Wheel 1