I chose a writer who matched my writing style and fulfilled every requirement I proposed. Practice test for UGC NET Computer Science Paper. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Here is the block diagram of Data Encryption Standard. The S-Box is used to provide confusion, as it is dependent on the unknown key. GATE CSE Resources. The DES Algorithm Cipher System consists of _____rounds (iterations) each with a round key. However, the DES algorithm has some major drawbacks which led to the failure of this algorithm. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Explanation: The DES Algorithm Cipher System consists of 16 rounds (iterations) each with a round key. In SDES, Encryption algorithm can be written as a composition of functions: IP-1 o fK2 o fK1 o SW o IP During decryption, we use the Inverse Initial Permutation (IP-1) before the IP. In the DES algorithm the round key is __________ bit and the Round Input is ____________bits. QUIZ1.docx - 1 Which of the following slows the cryptographic algorithm \u2013 1 Increase in Number of rounds 2 Decrease in Block size 3 Decrease in Key, Which of the following slows the cryptographic algorithm –. The Plaintext for the Ciphertext 11110000, given that the key is 0000000000 is. A cryptographic system based on Feistel cipher structure uses the same algorithm for both encryption and decryption. A preferable cryptographic algorithm should have a good avalanche effect. The number of tests required to break the Double DES algorithm are. It comes under block cipher algorithm which follows Feistel structure. See our User Agreement and Privacy Policy. 1. However, every 8th key bit is ignored in the DES algorithm… 3.The DES algorithm has a key length of a)128Bits b)32Bits c)64Bits d)16Bits Answer:c Explanation: DES encrypts blocks of 64 bits using a 64 bit key. The Initial Permutation table/matrix is of size, The number of iterations required to break the DES algorithm are. 5.piin terms of base 26 is b)LD 6.1 Encryption and decryption with DES At the encryption site, DES takes a 64-bit plaintext and creates a 64-bit ciphertext; at the decryption site, DES takes a 64-bit ciphertext and creates a 64-bit block of plaintext. Similarly, we can use the decryption technique using the same key viz. Data Encryption Standard Feistel Cipher is not a specific scheme of block cipher.

Later on, seeing the necessity and usage of the algorithm, the US government decided to disclose it for public usage. This has been a guide to DES Algorithm. “cipher” on the encrypted message to get our original text which is “It’s fun to learn”. Attempt a small test to analyze your preparation level. Confusion hides the relationship between the ciphertext and the plaintext. 1. DES algorithm has proved a milestone to the importance of network security or we can say importance to the security of message which needs to be transmitted over any medium. In the DES algorithm the round key is _____ bit and the Round Input is _____bits. (MCQs)focuseson “SymmetricCipher Models and Elementary I just wanted to share a list of sites that helped me a lot during my studies: .................................................................................................................................... www.EssayWrite.best - Write an essay .................................................................................................................................... www.LitReview.xyz - Summary of books .................................................................................................................................... www.Coursework.best - Online coursework .................................................................................................................................... www.Dissertations.me - proquest dissertations .................................................................................................................................... www.ReMovie.club - Movies reviews .................................................................................................................................... www.WebSlides.vip - Best powerpoint presentations .................................................................................................................................... www.WritePaper.info - Write a research paper .................................................................................................................................... www.EddyHelp.com - Homework help online .................................................................................................................................... www.MyResumeHelp.net - Professional resume writing service .................................................................................................................................. www.HelpWriting.net - Help with writing any papers ......................................................................................................................................... Save so as not to lose, How I Cured My Acne?

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