Presentation (2) ragul

[Audio] Data Encryption Standard (DES) Algorithm

[Audio] INTRODUCTION: • The Data Encryption Standard is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for modern applications, it has been highly influential in the advancement of cryptography. • Developed in the early 1970s at IBM and based on an earlier design by Horst Feistel, the algorithm was submitted to the National Bureau of Standards (NBS) following the agency's invitation to propose a candidate for the protection of sensitive, unclassified electronic government data. In 1976, after consultation with the National Security Agency (NSA), the NBS selected a slightly modified version (strengthened against differential cryptanalysis, but weakened against brute-force attacks), which was published as an official Federal Information Processing Standard (FIPS) for the United States in 1977..

[Audio] Explanation: • DES stands for Data Encryption Standard. There are certain machines that can be used to crack the DES algorithm. The DES algorithm uses a key of 56-bit size. Using this key, the DES takes a block of 64-bit plain text as input and generates a block of 64-bit cipher text. • The DES process has several steps involved in it, where each step is called a round. Depending upon the size of the key being used, the number of rounds varies. For example, a 128-bit key requires 10 rounds, a 192-bit key requires 12 rounds, and so on..

[Audio] Applications of DES Algorithm: • In this section, we are going to learn about some of the applications of the DES Algorithm. • It is used in random number generation • It is deployed when not-so-strong encryption is needed • It is used to develop a new form of DES, called Triple DES (using a 168-bit key formed using three keys).

[Audio] Advantages of the DES algorithm: •It is set as a standard by the US government. •When compared to the software, it works faster on hardware. •Triple DES, used a 168-bit key which is very hard to crack..

[Audio] Disadvantages of the DES algorithm: •Weakly secured algorithm. •There is a threat from Brute force attacks. •A DES cracker machine known as Deep Crack is available in the market..