The E5 'CIA Counting Station' Challenge
Welcome to the E5 Chalenge. Below is a link to a complete transcription of an E5 transmission, recorded on July 31 1997,  at 2115bst , frequency 8084usb. This transmission features 98 five figure groups. Nothing is known about the content of E5 traffic. Each transmission sends a variable number of five figure groups. Errors are rare with this station, which has been on the air for many years. Signal strength is very strong in Europe, and the schedule is ridgedly kept. 
Your task is to use whatever crypanalytic attack you can to decrypt this message. This cryptographic challenge is more daunting than the RSA challenge, because nothing is known about the algorithm used to encipher E5 transmissions. We do not even know for sure who the transmitting party is. If it is possible to decrypt some if not all of this message, using a  massively networked brute force attack, we may be able to discern something about what the E5 transmissions really are, and who is responsible for them. Use whatever crypanalytic attack you can to decrypt this message. If you require more plaintext examples, please email and we will provide you with further cyphertext. N.B. All email concerning this challenge must be PGP encrypted. Alternatively, you can record your own examples live off the air, from any one of a wide number of frequencies, seven days a week 
All claims to the prize must be accompanied by a full written description of how the crack was executed, along with any software that was used to achieve the crack. It must be demonstrated that the crack is a genuine mathematical soultion, since we do not have the original plaintext in our posession. 
The Prize for the first person to email us a deciphered text along with the method employed in the crack will be an ancient Gold Roman coin.  The Judges decision is final. 
 Let the cracking begin!
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