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 . 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. . 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. Rainbows (a.k.a. Spectrums). Public Private Key Encryption. HTTPS. Encryption. String Encryption. You have an account on . facebook. , LinkedIn, YouTube etc. . Your login: . costanza@seinfeld.com. Your password is : . 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]. Overview. Encryption technologies. Combining encryption technologies for practice. Using encryption technologies for identification – digital signatures. Public key infrastructure. 2. Introduction. Public Private Key Encryption. HTTPS. Encryption. String Encryption. You have an account on . facebook. , LinkedIn, YouTube etc. . Your login: . costanza@seinfeld.com. Your password is : . bosco. If this data was stored in a database, it might look like:. Cryptography. Is:. A tremendous tool. The basis for many security mechanisms. Is not:. The solution to all security problems. Reliable unless implemented and used properly. Something you should try to invent yourself. Diffie. -Hellman. The . ElGamal. . Public-key System. Online Cryptography Course Dan Boneh. Recap: public key encryption: . (Gen, E, D). E. D. pk. m. c. c. m. Dana . Dachman. -Soled. University of Maryland. Deniable Public Key Encryption. [Canetti, . Dwork. , . Naor. , . Ostrovsky. , 97]. Sender. Receiver.  .  . s.  . For any . in the message space, can produce a . Public key encryption from Diffie -Hellman The ElGamal Public-key System Online Cryptography Course Dan Boneh Recap: public key encryption: (Gen, E, D) E D Fall 2010. 1. Outline. Wired Equivalent Privacy (WEP). first security protocol defined in 802.11. Wi-Fi Protected Access (WPA). defined by Wi-Fi Alliance. WPA2. 802.11i. 2. In the early 1980s, the IEEE began work on developing computer network architecture standards. Slides by Prof. Jonathan Katz. . Lightly edited by me.. Review: private-key setting. Two (or more) parties who wish to securely communicate . share. a uniform, secret key k . in advance. Same key k used for sending or receiving. A digital signature allows the holder of the secret key (the signing key) to sign a document . Everyone who knows the verification key can verify that the signature is valid (correctness). No one can forge a signature even given the verification key even though he is given a signature. 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, .