PPT-Public Key Cryptography: Encryption, Signatures, FDH

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. Raymond Flood. Gresham Professor of Geometry. Overview. Key terms and guidelines. Caesar ciphers. Substitution cipher. Polyalphabetic cipher. Enigma. Modern . ciphers. Stream ciphers. Block ciphers. Diffie. Sixth Edition. by William Stallings . Chapter 9. Public Key Cryptography and RSA. “Every . Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good or little name was made public, the true or great name appears to have been carefully concealed. Aalto . University. , . autumn. . 2012. Outline. Symmetric encryption. Public-key encryption. Cryptographic authentication. 2. Most. . important. !. Brief. . introduction. to . encryption. and . CS 465. Last Updated. : . Aug 25, 2015. Outline. Provide a brief historical background of cryptography. Introduce definitions and high-level description of four cryptographic primitives we will learn about this semester. Chapter 9 - . Public-Key Cryptography. Fifth Edition. by William Stallings . Lecture slides by Lawrie Brown. Why Public-Key Cryptography?. developed to address two key issues:. key distribution. – how to have secure communications in general without having to trust a KDC with your key. Rahul Jain. CS6209, Jan – April 2011. http://www.comp.nus.edu.sg/~rahul/CS6209-11.html . Foundations of Cryptography : Basic Applications. Encryption Schemes .. Digital Signatures .. General Cryptographic Protocols . . CSE3002 – History of Computing. Group A: Daniel . Bownoth. , Michael Feldman, Dalton Miner, Ashley Sanders. Encryption. The process of securing information by transforming it into code.. Encrypted data must be deciphered, or . What is cryptography?. Ceasar. Cipher. Public key cryptography. What is cryptography?. Cryptography.  or . cryptology.  (from . Greek.  . κρυπτός.  . kryptós. , "hidden, secret"; and . Overview. Encryption technologies. Combining encryption technologies for practice. Using encryption technologies for identification – digital signatures. Public key infrastructure. 2. Introduction. UNIT 4 LESSON 7 – 2 DAY LESSON. VOCABULARY ALERT. :. asymmetric encryption.  - used in public key encryption, it is scheme in which the key to encrypt data is different from the key to decrypt. .. pk. , . sk. pk. c. . . . Enc. pk. (m). m. = . Dec. sk. (c). c. pk. pk. Public-key encryption. A public-key encryption scheme is composed of three PPT algorithms:. Gen: . key-generation algorithm. Signature schemes. A . signature scheme . is . defined by . three PPT algorithms . (Gen, . Sign, . Vrfy. ): . Gen: takes as input 1. n. ; outputs . pk. , . sk. Sign: . takes . as input a private key . P. ublic-key encryption ( Asymmetric Encryption). Asymmetric encryption is a form of cryptosystem in which . encryption and . decryption are performed using the different keys—one a public . key and . 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, .