Requirements for Public-Key Cryptography 4.Computationally infeasible to determine private key (KR b) knowing public key (KU b) 5.Computationally infeasible to recover message M, knowing KU b and ciphertext C 6.Either of the two keys can be used for encryption, with the other used for decryption: M=D KRb[E KUb(M)]=D KUb[E KRb(M)] Henric Johnson 6 In Asymmetric keys, two keys are used; private and public keys. Anyone using Email that is concerned about the security of the data being transferred should use Public Key Encryption. CSE497b Introduction to Computer and Network Security - Spring 2007 - Professor Jaeger Page Encryption algorithm • Algorithm used to make content unreadable by all but the intended receivers E(key,plaintext) = ciphertext D(key,ciphertext) = plaintext • Algorithm is public, key is … The Plan Ahead • How are ciphers designed? If the sender and receiver use different keys then it is said to be public key encryption. Remember BTL-1 17 Show what requirements must a public key crypto system to fulfil security. To decrypt the sender's message, only the recipient's private key may be used. 2. presentaion. In fact the security of any system depends on key length and the computa-tional work involved in breaking the cipher. Computer and Network Security by Avi Kak Lecture12 Back to TOC 12.1 PUBLIC-KEY CRYPTOGRAPHY •Public-key cryptography is also known as asymmetric-key cryptography, to distinguish it from the symmetric-key cryptography we have studied thus far. Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys - a public key and a private key. Asymmetric key encryption or public key encryption is used to solve the problem of key distribution. After agreeing on the type of encryption to be used in the connection, node B sends its public key to node Comparison of Symmetric and Asymmetric Cryptography with Existing Vulnerabilities and Countermeasures ... the malicious network. Figure 3 below illustrates the use of the two keys between node A and node B. That p-k encryption has superseded single key encryption. AN INTRODUCTION TO WIRELESS NETWORKING Wireless Internet access technology is being increasingly deployed in both office and public environments, as well as by the Internet users at home. Wireless Networking Security Page 4 of 29 I. A look at the encryption algorithm and its security benefits. However, it is possible to use public-key encryption to send a symmetric key, which can then be used to encrypt additional data. Cryptography and Network Security Lectured by NguyễnĐứcThái Public Key Cryptography Chapter 3. Because the message was encrypted using A's private key, only A could have prepared the message. cloud security homomorphic encryption. The way in which the plain text is processed A block cipher processes the input and block of elements at a time, producing output block for each input block. 15 Define the principle elements of a public key crypto system. anyone public key easily, usually via some form of directory service, then the two parties can communicate securely and with little effort, i.e. We begin by outlining some of the basic technologies of wireless network systems. In many cases, the encryption and decryption keys are the same. • A weakness in security procedures, network design, or implementation that can be exploited to violate a corporate security policy – Software bugs – Configuration mistakes – Network design flaw – Lack of encryption • Exploit – Taking advantage of a vulnerability In public key cryptography, encryption key is made public, but it is computationally infeasible to find the decryption key without the information known to the receiver. Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 09­13 May 2005 Public-Key Systems Shared-key ==> difficulties in key distribution – C(n,2) = O(n^2) keys Public key system – Public component and a private component – Two kinds: Public key distribution: establish shared key first Public key cryptography: use public/private keys in without a prior key distribution arrangement.

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