Database: Secret coding techniques
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Intelligence is key during wartime, especially when the contours of the two opposite sides are blurry, as occurred during the American Revolution. Guerrilla-style actions also implied solid spying and secrecy techniques. The interception of a message could have disastrous consequences and using secret correspondence was even more crucial since both sides spoke the same language! Leaders and agents used classic techniques such as the famous invisible ink made of lemon juice or vinegar, only revealed by heating. They also used masked letters with the secret text revealed by a pre-cut shape. More complex coding techniques were frequent as well: Thomas Jefferson himself, the future president of United States, invented the "Jefferson Cylinder", a coding tool with wheels and a cypher key to encrypt and decrypt messages.