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The National Cipher Challenge

The run in

As we approach the final challenge we will give less help, relying on you to break the ciphers. We will continue to publish case files, but you can’t necessarily expect to know who sent each message to who, the ciphers will get harder, and you may find that the protagonists are trying to make it harder to break their ciphers with some unusual twists. You can also keep an eye out for messages in case we need to contact you, read the news items and follow the discussions on the forum to find additional help.

Have fun,

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