The Data Encryption Standard (DES) is a standardized symmetric encryption algorithm developed by IBM in the early 1970s.
This development provided the first secure symmetric encryption method for computers and is now considered a pioneer in modern cryptography. DES was originally developed for hardware encryption, which is why its use within software is comparatively slow.
The DES works both to encrypt and decipher a message with the same key. This means that the sender and recipient of the message use and know the same key. Today, DES — due to the comparatively low key length — is considered insecure and has been replaced by the Advanced Encryption Standard (AES).
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