PPT-Modern symmetric-key Encryption

Citation I would like to thank Claude Crepeau for allowing me to use his slide from his crypto course to mount my course Some of these slides are taken directly from his course Comp 547 at Mcgill. 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). Symmetric-key algorithms. use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. split into:. stream ciphers. block ciphers. Stream cipher. key and algorithm are applied to each binary digit in a data stream, one bit at a time. Name : . Maryam Mohammed . Alshami. ID:. H00204657. Encryption. : . is the process of encoding messages or information in such a way that only authorized parties can read it. .. Important part of computing to keep our file . 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?. OGRAPHY. Dr. Andy Wu. BCIS . 4630 Fundamentals of IT Security. Overview. 2. Key crypto concepts. Key terms. XOR. Symmetric encryption. Asymmetric encryption. Hashes. Cryptography. 3. Cryptography primarily protects confidentiality, integrity, authentication, and non-repudiation.. A network LAN can be secured through:. Device hardening. AAA access control. Firewall features. IPS . implementations. How is network traffic protected when traversing the public Internet? . Using cryptographic . 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 : . CS 161: Computer Security. Prof. . Raluca. Ada . Popa. Sept 13, 2016. Announcements. Project due Sept 20. Special guests. Alice . Bob. The attacker (Eve - “eavesdropper”, Malice). Sometimes Chris too. 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:. Confidentiality, integrity, and availability concepts – CIA. Security Governance principles. Compliance, Legal, and Regulatory issues – SOX and Regulatory Guidelines – There will be memorization questions on the test. Crypto Concepts Symmetric encryption, Public key encryption, and TLS 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 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 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 . Techniques . Symmetric Cipher Model. Basic terminology:. Plaintext:. original message to be encrypted. Cipher text: . the encrypted message. Enciphering or encryption Algorithm: . The process of converting plaintext into cipher text..