Episode 3149
Caesar cipher
Thu, 2025-Dec-18 00:20 UTC
Length - 1:45
Direct Link
Welcome to featured Wiki of the Day, your daily dose of knowledge from Wikipedia's finest articles.
The featured article for Thursday, 18 December 2025, is Caesar cipher.
In cryptography, a Caesar cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
The encryption step performed by a Caesar cipher is often incorporated as part of more complex schemes, such as the Vigenère cipher, and still has modern application in the ROT13 system. As with all single-alphabet substitution ciphers, the Caesar cipher is easily broken and in modern practice offers essentially no communications security.
This recording reflects the Wikipedia text as of 00:20 UTC on Thursday, 18 December 2025.
For the full current version of the article, see Caesar cipher on Wikipedia.
This podcast uses content from Wikipedia under the Creative Commons Attribution-ShareAlike License.
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Until next time, I'm long-form Patrick.
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