This looks like it could have been inspired by the Cipher Challenge[1] from The ... | Hacker News

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mortehu on March 24, 2016 | parent | context | favorite | on: Do you have the brains for cybersecurity?

This looks like it could have been inspired by the Cipher Challenge[1] from The Code Book[2], which starts with monoalphabetic substitution problems.

1. http://simonsingh.net/cryptography/cipher-challenge/the-ciph...

2. http://www.amazon.com/The-Code-Book-Science-Cryptography/dp/...

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