Decoding Encryption with Permission...

[902]

I would record a 10 second message and post it somewhere. I would imagine that the sooner it was decoded, the better the prize would be. So if it's decoded within 24 hours, the prize would be... snip

Am I crazy?

You're going to post something? What's the sport in that?

My competition proposal: Within a 3 month period and a confined area of 560 square miles, an encrypted P25 DES-OFB transmission will occur once from a portable radio on one of 16 possible VHF channels from 136 - 174 MHz.

The challenge: Decode the message and perform the action to get a surprise.

The winner gets what I get at work when I do something right (I work in the public sector... who's really crazy?).

 

[rescue161]

Contest Starts Now!!!

Okay, you guys ready to win?

The winner gets a Pro-96 (used - batteries not included, original box, original manual, original antenna, both battery holders) IF they crack the code within 24 hours from time of this post. "Cracking the code" involves sending me the recovered CLEAR audio of my voice stating the entire message via email or posting it directly to this thread AND telling me how they did it. If the audio/message is good to go, you get the used Pro-96 mentioned above.

If for any reason, the allotted time (24 hours) passes with no 'winner', then the Pro-96 is no longer offered up.

If someone can produce the CLEAR audio of my voice stating the entire message after the 24 hour time period, but BEFORE 1 week of the time of post, then they will receive the actual radio that was used to make these recordings (Model 1 Systems Saber 438-470 MHz).

Members of the NSA or their affiliates are not allowed to win!!!

Lucky guesses at keys are also off limits!!!

RULES:

To claim your prize you MUST:

1) Send me (rescue161) the CLEAR audio of the entire message in MP3 or WAV format.

2) Provide how you decoded it.

3) Provide what you used to decode it, i.e., what software, hardware, etc.

4) Software/hardware that is used MUST be available to anyone. No proprietary hardware / firmware is allowed to be used in this contest.

5) I MUST be able to duplicate the decode process. If I cannot duplicate what you did, then all bets are off.

6) Last but not least, Lucky guesses at keys will not be awarded prizes.

7) If the winner can provide the above information BEFORE the 24 hour period and win the Pro-96, then the Systems Saber will no longer be offered as a prize.

For anyone that may not understand, you MUST provide a systematic way of decoding MY DES transmission.

Remember, I've made it EASY for you. It's the same key for you to try to decode. At least it isn't changing on you every 12 hours.

GOOD LUCK TO ALL!

 

[rescue161]

Here is the discriminator tap audio:
http://www.geocities.com/rescue161/DES_Contest-Discriminator.mp3

Here is the speaker jack audio:
http://www.geocities.com/rescue161/DES_Contest-Speaker_Audio.mp3

Good luck!

 

[Grog]

Done J/K :lol:


Interested to see if this finally shuts everyone up about how "easy" it is to break

 

[rescue161]

Done J/K :lol:


Interested to see if this finally shuts everyone up about how "easy" it is to break

Me too. I am sick to death of everyone bringing up the "DES was cracked years ago" debate. Sure, DES was cracked using a TEXT document. That is WAY different than cracking a radio transmission and decoding the voice/message out of it.

Just to clarify, this is the 1970's DES, not the new and improved AES. Give it your best shot, I still have my money on DES.

Again, good luck guys.

 

[JnglMassiv]

Ruh-roh

 

[rescue161]

Well, I figured that was going to happen.

Is there anyone willing to host the two files? They are VERY small.

 

[SCPD]

Here is a link that proves it has been done within 24Hrs.
http://research.sun.com/features/encryption/

In recent years, the cryptography community repeatedly demonstrated DES's limitations. One such demonstration was a January, 1999, assault involving a combination of 100,000 networked PCs and a $250,000 computer built by the Electronic Frontier Foundation (EEF). It decrypted a DES-encoded message in 22 hours.

Now will any of us be able to decode it within 24hrs probably not.

 

[scannerfreak]

Well, I figured that was going to happen.

Is there anyone willing to host the two files? They are VERY small.

send them to me, I'll put them up on my Comcast for ya

scannerfreak@radioreference.com

 

[JnglMassiv]

Now will any of us be able to decode it within 24hrs probably not.

Not to mention (well, to be fair, it was mentioned earlier in the thread) that text is far easier to decode than voice. Using c.2006 processors instead of 1999 vintage machines would make the 22 hour mark quite a bit shorter, too.

 

[scannerfreak]

Ok here they are:

discriminator tap audio

speaker jack audio


right click, save as

 

[JnglMassiv]

The first link is borked, scanner_freak. Too many //'s.

You know, I'd be impressed if anyone could recover the message even if Scott released the key. I can't think of an easy way to do it.

 

[XTS3000]

In order to get a reliable stream to decode, the scrambled audio has to be from the discrimanator and feed through a 4 level FSK decoder. The result would be a pure digital binary file - not audio file. Also start recording a few seconds before you key up, we need the syncro packets of data trasnmitted at the beginning of the secure transmission.

Also to give this project any chance of succesing, start your key with a number 1. Something like 1F30 4DC3 9FAB 29D6
That way if someone does lock onto the packets, they it will therotecially take 1/16 the time to decode becasue we wouldn't have to scan through 2,3,4,5,6,7,8,9,a,b,c,d,e,f. Only would have to scan the 1's

If anyone does indeed crack it, then try a different key. Start simple

 

[rescue161]

Here is a link that proves it has been done within 24Hrs.
http://research.sun.com/features/encryption/

In recent years, the cryptography community repeatedly demonstrated DES's limitations. One such demonstration was a January, 1999, assault involving a combination of 100,000 networked PCs and a $250,000 computer built by the Electronic Frontier Foundation (EEF). It decrypted a DES-encoded message in 22 hours.

Now will any of us be able to decode it within 24hrs probably not.

Dude, you are WAY off. That was a text file that they decoded.

Please don't post things like, "In recent years, the cryptography community repeatedly demonstrated DES's limitations. One such demonstration was a January, 1999, assault involving a combination of 100,000 networked PCs and a $250,000 computer built by the Electronic Frontier Foundation (EEF). It decrypted a DES-encoded message in 22 hours." because that was a TEXT FILE!!! NOT AUDIO!

Do me a favor an post MY audio in the encrypted file to prove the masses wrong.

Even if it is after the 1 week period, there will still be a "prize" so to speak.

 

[scannerfreak]

fixed the link, my bad

 

[rescue161]

Here is the disc file...

PLEASE "right click" and "save as"

http://home.comcast.net/~scanner_freak/DES_Contest-Discriminator.mp3

 

[rescue161]

Scanner_freak, the "audio" file worked great, but the 'disc' file would not load. I think the post that I made will work.

 

[scannerfreak]

Ok, I think I edited it correctly to, the http got cut off when I was doing the code for the links..

 

[RainbowSix]

I think that was FSK, so as long as it is not filtered too much and you have a good edge detector circuit (or software) you should be able to recover the data from a audio file.

Where would one find software and or equipment to even start to try and decode the data stream and so on???

R6

 

[rescue161]

Where would one find software and or equipment to even start to try and decode the data stream and so on???

R6

That's what this thread is all about.