The Decline of Historical Ciphers

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 What caused these once-powerful ciphers to become obsolete?

✅ Frequency Analysis – Simple substitution ciphers were broken by analyzing letter usage patterns.
✅ Brute-Force Attacks – Computers made it easy to test thousands (or millions) of possible keys.
✅ Mathematical Cryptanalysis – Methods like Kasiski examination exposed weaknesses in polyalphabetic ciphers.
✅ Rise of Computers – Machines like Colossus (used to break the Lorenz cipher) revolutionized decryption.

With the development of modern cryptography, historical ciphers became learning tools rather than practical encryption methods.


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