PPT-Public key encryption, Digital signature and authentication

P ublickey encryption Asymmetric Encryption Asymmetric encryption is a form of cryptosystem in which encryption and decryption are performed using the different keysone a public key and . All rights reserved Reproduction of this publication in any form without prior writt en permission is forbidden White Paper Business solutions through information technology brPage 2br Public Key Encryption and Digital Signature How do they work TAB Chapter 8. Cryptology. Cryptography . Comes from Greek. Kryptos. meaning “hidden”. Grahein. meaning “to write”. Process of making and using codes to secure the transmission of information. Cryptanalysis. Cryptographic Tools (. cont. ). modified from slides of . Lawrie. Brown. Message Authentication. protects against active attacks. verifies received message is authentic. can use conventional encryption. Aalto . University. , . autumn. . 2012. Outline. Symmetric encryption. Public-key encryption. Cryptographic authentication. 2. Most. . important. !. Brief. . introduction. to . encryption. and . Using cryptography in mobile computing. . Cryptography basics: symmetric, public-key, hash function and digital signature . Cryptography, . describing the art of secret communication, comes from Greek meaning “secret writing.” Cryptography has growth in tandem with technology and its importance has also similarly grown. Just as in its early days, good cryptographic prowess still wins wars. . Slides by Kent Seamons and Tim van . der. Horst. Last Updated: Oct . 7. , 2013. Digital Signatures. Diagram illustrating how to sign a message. Why do we use a one-way hash?. How does a collision or second pre-image attack relate to this?. The ROM, FDH, using the ROM. From previous lecture. Ciphers . Stream ciphers : many follow OTP + PRG strategy. Block ciphers : work on plaintext of limited size = block. output ciphertexts of same size. security I. Uyen. Dang & Michel . Foé. Agenda. Context. Architectural considerations of security issues in WS. Security threats in Web services. Basic concepts (prerequisites). XML independent tools or technologies. . Chapter . 11. Network Security. 1. Security Assessment. What is at risk?. Consider effects of risks. Different organization types have different risk levels. Posture assessment. Thorough network examination . 1. What is cryptography?. Cryptography is a mathematical method of protecting information. Cryptography is part of, but not equal to, security. Predated modern computing. In modern computing, crypto is used to . Different ways to achieve security of communication data. Keep things under lock and key. Physical. Encryption. Through password protection. Sender, Listener, Eavesdropper. What is the most frequent concern you have about browsing and security?. Student name: Lindokuhle Duma. Supervisor: Prof. Tucker. Proposed overall solution. P. attern authentication. Visual for Deaf users instead of text . Deaf people are accustomed to signed language. Easy to remember visuals than text [1]. PKothakotaNear PakalaChittoorLECTURE NOTESDEPARTMENT OFCOMPUTER SCIENCE AND ENGINEERINGSUBJECT NAME INFORMATION SECURITYBRANCH CSEYEAR AND SEMESTER IV I COURSE BTECHREGULATIONR15INDEX1Unit-I TopicPag Arpita. . Patra. In PK setting, . privacy . is provided by . PKE. Digital Signatures. . I. ntegrity/authenticity. is provided by digital signatures (counterpart of MACs in PK world). Definition:. A Digital signature scheme  consists of three PPT algorithms (Gen, Sign, .