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and events from their textbooks and receive an introduction to the world of cryptanalysis
Join the Codebreaking Club and put your cryptanalyst skills to the test with one real secret message from the past each month
This full-year membership includes 52 historic letters per purchase
Explore Stoicism The Right Way: Great philosophy isn’t meant to be binged
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The Codebreaking Club (Single Letter) Choose Your Start Month:Expedited (+$4.99) and events from their textbooks"Like Sudoku For Spies" Think you'd make a good spy? Join the Codebreaking Club and put your cryptanalyst skills to the test with one real secret message from the past each month. Never solved a cipher before? With the Codebreaking Club, learning to solve ciphers is easy. Every Codebreaking Club envelope includes step by step instructions for deciphering your latest message. You'll be cracking codes in no time! Each Codebreaking Club envelope
US$ 925.00
US$ 1225.00
US$ 1975.00