Hannah handed me a piece of paper with the following string of letters. “Each letter stands for another one,” said Hannah. “Ooh, a substitution cipher!” I thought. But I was stumped. “Is this just one ...
You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. This morning, the NSA Careers Twitter account posted what looked like a series of nonsense letters: ...
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