Nađ, Ivan (2014) DES i AES. Diploma thesis, Faculty of Science > Department of Mathematics.

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The Data Encryption Standard (DES) is a specification for a symmetric-key algorithm for the encryption of electronic data adopted by the U.S. National Bureau of Standards (NBS) on January 15, 1977 after a 4 year-long contest and standardization process. It was developed by an IBM team, with Horst Feistel’s lead, around 1974. DES applies a 56-bit key to each 64-bit block of data. The process can run in several modes and involves 16 rounds or operations. Many cryptanalysts have attempted to find shortcuts for breaking the system. Early in 1997, a cooperative effort on the Internet of over 14,000 computer users trying out various keys finally deciphered the message, discovering the key after running through only 18 quadrillion of the 72 quadrillion possible keys. NIST has later indicated DES that will not be recertified as a standard and submissions for its replacement are being accepted. The next standard will be known as the Advanced Encryption Standard (AES). The Advanced Encryption Standard (AES) is a specification for the encryption of electronic data adopted by the U.S. National Institute of Standards and Technology (NIST) on November 26, 2001 after a 5-year standardization process in which fifteen competing designs were presented and evaluated before Rijndael was selected as the most suitable. Each AES cipher has a 128-bit block size, with key sizes of 128, 192 and 256 bits. The AES ciphers have been analyzed extensively and are now used worldwide, as was the case with its predecessor, the Data Encryption Standard (DES). AES is the first publicly accessible and open cipher approved by the NSA.

Item Type: Thesis (Diploma thesis)
Supervisor: Franušić, Zrinka
Date: 2014
Number of Pages: 36
Subjects: NATURAL SCIENCES > Mathematics
Divisions: Faculty of Science > Department of Mathematics
Depositing User: Iva Prah
Date Deposited: 11 Jun 2015 11:55
Last Modified: 11 Jun 2015 11:55

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