From the course: Learning Cryptography and Network Security

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Developing DES

Developing DES

From the course: Learning Cryptography and Network Security

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Developing DES

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- [Instructor] In 1973, the National Institute of Standards and Technology or NIST issued a public request for an encryption algorithm. It had to meet several criteria that included a high level security, be easily understood, adaptable, economical, efficient and exportable. In 1974, IBM submitted Lucifer, a block cipher developed by Feistel and his colleagues. Lucifer was evaluated by the National Security Agency who then reduced the key length from 128 bits to 56 bits and changed the inner workings. This then became the Data Encryption Standard or DES and was adopted in 1977 as the government standard for encrypting data. It's also known as Data Encryption Algorithm or DEA. The publication of DES prompted a lot of research in cryptography. So let's talk about DES. DES is a minor variation of the Feistel cipher. It encrypts a 64-bit block of data using a 56-bit key. From the 56-bit key, 16 sub keys are generated and…

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