ePayment Security ECOM 6016 Electronic Payment Systems • Keep financial data secret from unauthorized parties (privacy) – CRYPTOGRAPHY Lecture 3 ePayment Security • Verify that messages have not been altered in transit (integrity) – HASH FUNCTIONS • Prove that a party engaged in a transaction ( (nonrepudiation) ) – DIGITAL SIGNATURES • Verify identity of users (authentication) – PASSWORDS‚ DIGITAL CERTIFICATES THE UNIVERSITY OF HONG KONG FEB/MAR 2012 © 2012 MICHAEL I. SHAMOS
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the study of hiding readable messages (plaintext) into a non-readable form (ciphertext). Based on my other source Cryptography is the practice and study of techniques for secure communication in the presence of third parties. To make it simple‚ Cryptography is used in order to make sure that your messages and data are secured from other elements. The method of disguising plaintext in such a way as to hide its substance is called encryption. Encrypting plaintext will result to meaningless data called
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worldwide email accounts in 2012‚ and are expected to increase to 4.3 billion accounts in 2016. In general‚ transfer of email has many protocols; the SMTP is a main one. In this protocol‚ the content is required to be plaintext for transfer. So‚ the detail of email is actual send as plaintext. Any attempted individual or group can intercept emails. For example‚ companies or websites reply a notice mail to you for confirming you register information. This kind of mail usually contains some sensitive information
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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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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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who knew Caesar’s "shift" rule could decipher his messages (Network Associates‚ Inc.‚ 1990-1999). The Caesar cipher is one of the earliest known and simplest forms of cryptography. It is a type of substitution cipher in which each letter in the plaintext is shifted a certain number of places down the alphabet. For example‚ with a shift of 1‚ A would be replaced by B‚ B would become C‚ and so on (Lyons‚ 2009 - 2012). Caesar’s encryption method would be known as symmetric cryptography today. Cryptography
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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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encryption is a type of cryptographic system where each party has both a private and a public key‚ which are mathematically linked to each other. The public key is used for encrypting plaintext to “ciphertext” (essentially‚ gibberish)‚ while the private key is used for decrypting that gibberish back into plaintext. Once a message has been encrypted by a public key‚ it can only be decrypted with the corresponding private key. Neither key can perform both functions by itself. The public key can be
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Question 1 0 out of 3.704 points Public-key encryption is based on a ____. Selected Answer: d. key Answers: a. message authentication code (MAC) b. certificate c. hash value d. key Question 2 3.704 out of 3.704 points Which symmetric encryption cryptosystems was developed to replace both DES and 3DES? Selected Answer: b. AES Answers: a. WEP b. AES c. DES d. RSA Question 3 3.704 out of 3.704 points Hash ____ are mathematical functions that create a hash
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THE WILLIAM STALLINGS BOOKS ON COMPUTER DATA AND COMPUTER COMMUNICATIONS‚ EIGHTH EDITION A comprehensive survey that has become the standard in the field‚ covering (1) data communications‚ including transmission‚ media‚ signal encoding‚ link control‚ and multiplexing; (2) communication networks‚ including circuit- and packet-switched‚ frame relay‚ ATM‚ and LANs; (3) the TCP/IP protocol suite‚ including IPv6‚ TCP‚ MIME‚ and HTTP‚ as well as a detailed treatment of network security. Received the 2007
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