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Can you share the notes of your teacher?
Data Encryption Standard (DES) is an outdated symmetric key method of data encryption. It was adopted in 1977 for government agencies to protect sensitive data and was officially retired in 2005.
IBM researchers originally designed the standard in the early 1970s. It was then adopted by the U.S. National Bureau of Standards — now the National Institute of Standards and Technology, or NIST — as an official Federal Information Processing Standard (FIPS) in 1977 for the encryption of commercial and sensitive yet unclassified government computer data.
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no notes but resources from geeksforgeeks.com and tutorialspoint might give you some extra knowledge