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6: Cryptography
https://math.libretexts.org/Courses/Las_Positas_College/Math_for_Liberal_Arts/06%3A_Cryptography
Thumbnail: Alphabet shift ciphers are believed to have been used by Julius Caesar over 2,000 years ago. Caesar cipher with a shift of 3. Plaintext is at the top, Ciphertext is at the bottom. (Public D...Thumbnail: Alphabet shift ciphers are believed to have been used by Julius Caesar over 2,000 years ago. Caesar cipher with a shift of 3. Plaintext is at the top, Ciphertext is at the bottom. (Public Domain; Matt_Crypto via Wikipedia).

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