The Pocket GuideSome spy groups created their own pocket guide that functioned as a code cipher (1). Spies would receive letters from one another and use their cipher to decode the letter for the actual message. The most known code book belonged to the Culper Ring in New York. The members would send encoded messages to each other and eventually to George Washington and use their pocket guide to decipher them. The Culper Ring's codes book was numerical and consisted of 763 numbers that represented different words (2).
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The Culper Ring Pocket Guide (3)
1. Mount Vernon Ladies' Association. "Spy Techniques of the Revolutionary War."
2. Ibid.
3. Maj. Benjamin Tallmadge. "The Culper Code Book." 1778. Mount Vernon.
2. Ibid.
3. Maj. Benjamin Tallmadge. "The Culper Code Book." 1778. Mount Vernon.