Lucifer

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Notion

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Science and technology

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What Wikipedia says

In cryptography, Lucifer was the name given to several of the earliest civilian block ciphers, developed by Horst Feistel and his colleagues at IBM. Lucifer was a direct precursor to the Data Encryption Standard. One version, alternatively named DTD-1, saw commercial use in the 1970s for electronic banking.

Excerpt from the Wikipedia article “Lucifer (cipher)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia