PPT-Public Key Encryption

Dan Fleck CS 469 Security Engineering These slides are modified with permission from Bill Young Univ of Texas Coming up Public Key Encryption 1 1 Public Key Encryption In 1976 Whitfield . CSE 5351: Introduction to Cryptography. Reading assignment:. Chapter 2. Chapter 3 (sections 3.1-3.4). You may skip proofs, but are encouraged to read some of them.. 2. Computational Difficulty (One-Way Functions). 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 . from trapdoor permutations. The RSA trapdoor permutation. Online Cryptography Course Dan Boneh. Review: trapdoor permutations. Three algorithms: (G, F, F. -1. ). usna. . si110. Symmetric Encryption Limitations. Symmetric encryption algorithms use the . same key for encryption and decryption. Both parties must agree to a secret key. Fundamental limitation. How do you exchange a secret key?. 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. David Froot. Protecting data By encryption . How do we transmit information and data, especially over the internet, in a way that is secure and unreadable by anyone but the sender and recipient?. Encryption is simply the process of transforming information, such as plain text or numbers, using an algorithm. Only those with the algorithm can decipher the encrypted information, and even a relatively simple encryption technique can be difficult to decode without the key. . 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 : . Is Encryption Safe?. Yes, Encryption is safe. The amount of time, energy and cost to crack most modern cryptographic technologies makes the act of attempting to decrypt encrypted code an expensive task that is, virtually speaking, inevitable. Although encryption does have vulnerabilities that rest largely outside of the power of the technology. Meaning if you give someone a USB with the key or tell them it.. 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. 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. Authenticated Encryption and Cryptographic Network Protocols David Brumley dbrumley@cmu.edu Carnegie Mellon University Some Straw Men 2 TCP/IP (highly abstracted) packet Destination Machine TCP/IP Stack 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. 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 .