CRYPTOGRAPHY- ENCRYPTION AND DECRYPTION Cryptography is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). More generally‚ it is about constructing and analyzing protocols that overcome the influence of adversaries and which are related to various aspects in information security such as data confidentiality‚ integrity‚ authentication‚ and non-repudiation. Modern cryptography intersects the disciplines of mathematics‚ computer science
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Adaptive chosen ciphertext attacks on the McEliece cryptosystem 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 The McEliece Public–Key Cryptosystem . . . . . . . . . . . . . . . . 2.3 An adaptive chosen ciphertext attack . . . . . . . . . . . . . . . . . . 2.4 Countermeasures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 Conclusion
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A TERM PAPER ON “Blowfish Encryption Algorithm“BLOWFISH ENCRYPTION ALGORITHM” WRITTEN BY NDIFON‚ PATRICK MANYOR 10/50050 COMPUTER SCIENCE UNIVERSITY OF CALABAR SUBMITTED TO DR. F.U. OGBAN COURSE LECTURER IN PARTIAL FUFILMENT OF THE COURSE REQUIREMENT CSC4211 SEPTEMBER 2014 TABLE OF CContentsONTENTS 1. Introduction 2. Origin/Founder 3. Algorithm/Data Structures 4. Category/Performance: 5. Pseudocode 6. Implementation: C++‚ Java 7. Compare: Associated algorithm 8. Summarize
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UNIVERSITY OF CENTRAL LANCASHIRE MODULE : COMPUTER SECURITY (CO4509) TUTOR: MARTIN BATEMAN Assignment – literature investigation submitted by – PYARELAL BANGLOORI Reg. no: 20447838 Theory of Cryptanalysis Introduction Cryptanalysis is a very sophisticated science that encompasses a wide variety of test and attacks. Cryptanalysis is the science of studying
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www.ijraset.com Vol. 2 Issue V‚ May 2014 ISSN: 2321-9653 I N T E R N A T I O N A L J O U R N A L F O R RE S E A R C H I N A P P L I E D S C I E N C E AN D E N G I N E E R I N G T E C H N O L O G Y (I J R A S E T) Feasibility Evaluation of Symmetric Key Encryption Techniques for Wireless Channel and Disk Storage Md Asif Mushtaque1‚ Mr. Khushal Singh2 School of Computing Science and Engineering‚ Galgotias University Abstract— Network security has become very important and challenging
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There are two basic types of encryption; asymmetrical and symmetrical. Asymmetrical uses two keys; a public and a private key. The public and the private keys have unique characteristics. In asymmetric encryption you can encrypt with a public key that has a matching private key used for decryption. The other basic type of encryption is called symmetric encryption; the main difference between the two is that symmetrical encryption uses only one key; a private key used for both encryption and decryption
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To break a message encrypted with private-key cryptography‚ it requires either to exploit a weakness in the encryption algorithm‚ or to try an exhaustive search of all possible keys (brute force method). Increase in key size is an e ective remedy for this. If the key is large enough (e.g.‚ 128 bits)‚ such a search would take a very long time (few years)‚ even with very powerful computers. Private-key methods are ecient and dicult to break[21]. However‚ one major drawback is that the key must be
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Rotor machine From Wikipedia‚ the free encyclopedia (Redirected from Rotor machines) Jump to: navigation‚ search A series of three rotors from an Enigma machine‚ used by Germany during World War II In cryptography‚ a rotor machine is an electro-mechanical device used for encrypting and decrypting secret messages. Rotor machines were the cryptographic state-of-the-art for a brief but prominent period of history; they were in widespread use in the 1930s–1950s. The most famous example is
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International Journal of Network Security & Its Applications (IJNSA)‚ Vol.3‚ No.6‚ November 2011 ROLE OF MULTIPLE ENCRYPTION IN SECURE ELECTRONIC TRANSACTION Himanshu Gupta Senior Faculty Member‚ Amity Institute of Information Technology‚ Amity University Campus‚ Sector – 125‚ Noida (Uttar Pradesh)‚ India. E-mail: himanshu_gupta4@yahoo.co.in Vinod Kumar Sharma Professor & Dean‚ Faculty of Technology‚ Gurukula Kangri Vishwavidyalaya‚ Haridwar‚ India E-mail: vks_sun@ymail.com ABSTRACT
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The decrypted message is ’cat’. 3. Changing the plaintext to numbers yields 7‚ 14‚ 22‚ 0‚ 17‚ 4‚ 24‚ 14‚ 20. Applying 5x + 7 to each yields 5 · 7 + 7 = 42 ≡ 16 (mod 26)‚ 5 · 14 + 7 = 77 ≡ 25‚ etc. Changing back to letters yields QZNHOBXZD as the ciphertext. 4. Let mx + n be the encryption function. Since h = 7 and N = 13‚ we have m · 7 + n ≡ 13 (mod 26). Using the second letters
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