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Lecture Data security and encryption - Lecture 7: Data encryption standard (DES)

This chapter presents the following content: Data encryption standard (DES) strengths of DES, differential & linear cryptanalysis, block cipher design principles, differential & linear cryptanalysis, block cipher design principles. | Data Security and Encryption (CSE348) Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, briefly reviewing the text outline from Ch 0, and then presenting the content from Chapter 1 – “Introduction”. Lecture # 7 Review have considered: block vs stream ciphers Feistel cipher design & structure Chapter 3 summary. Data Encryption Standard (DES) most widely used block cipher in world adopted in 1977 by (National Bureau of Standards) NBS (now NIST) as FIPS PUB 46 encrypts 64-bit data using 56-bit key has widespread use has been considerable controversy over its security The most widely used private key block cipher, is the Data Encryption Standard (DES). It was adopted in 1977 by the National Bureau of Standards as Federal Information Processing Standard 46 (FIPS PUB 46). DES encrypts data in 64-bit blocks using a 56-bit key. The DES enjoys widespread use. It has also been the subject of much controversy its security. DES History IBM developed Lucifer cipher by team led by Feistel in late 60’s used 64-bit data blocks with 128-bit key then redeveloped as a commercial cipher with input from NSA and others In 1973 NBS issued request for proposals for a national cipher standard IBM submitted their revised Lucifer which was eventually accepted as the DES In the late 1960s, IBM set up a research project in computer cryptography led by Horst Feistel. The project concluded in 1971 with the development of the LUCIFER algorithm. LUCIFER is a Feistel block cipher that operates on blocks of 64 bits, using a key size of 128 bits. Because of the promising results produced by the LUCIFER project, IBM embarked on an effort, headed by Walter Tuchman and Carl Meyer, to develop a marketable commercial encryption product that ideally could be implemented on a single chip. It involved not only IBM researchers but also outside consultants and technical advice from NSA. The outcome of this effort was a . | Data Security and Encryption (CSE348) Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, briefly reviewing the text outline from Ch 0, and then presenting the content from Chapter 1 – “Introduction”. Lecture # 7 Review have considered: block vs stream ciphers Feistel cipher design & structure Chapter 3 summary. Data Encryption Standard (DES) most widely used block cipher in world adopted in 1977 by (National Bureau of Standards) NBS (now NIST) as FIPS PUB 46 encrypts 64-bit data using 56-bit key has widespread use has been considerable controversy over its security The most widely used private key block cipher, is the Data Encryption Standard (DES). It was adopted in 1977 by the National Bureau of Standards as Federal Information Processing Standard 46 (FIPS PUB 46). DES encrypts data in 64-bit blocks using a 56-bit key. The DES enjoys widespread use. It has also been the subject of much controversy its .