PPT-1 Symmetric-Key Encryption

CSE 5351 Introduction to Cryptography Reading assignment Chapter 2 Chapter 3 sections 3134 You may skip proofs but are encouraged to read some of them 2 Computational Difficulty OneWay 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 . CSE 5351: Introduction to Cryptography. Reading assignment:. Chapter 3 . Read sections 3.1-3.2 first (skipping 3.2.2). 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Pseudorandom Generators and Stream Ciphers. OGRAPHY. Dr. Andy Wu. BCIS . 4630 Fundamentals of IT Security. Overview. Key crypto concepts. Key terms. XOR. Symmetric encryption. Asymmetric encryption. Hashes. 2. Cryptography. 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 . October 2015. What’s New in PKI and SSL?. The State of PKI and SSL/TLS. Many organizations don’t run their own Public Key Infrastructure. Utilize a managed PKI, or MPKI. Almost all organizations have a website and need public certificates. 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. 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. 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. modified from slides of . Lawrie. Brown. Cryptographic Tools. Cryptographic . algorithms . important . element in security . services. review various types of elements. symmetric encryption. public-key (asymmetric) encryption. 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 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 . Symmetric . Key Distribution Using Asymmetric Encryption . Distribution . of Public Keys. Key Management and Distribution. Symmetric Key Distribution Using Symmetric Encryption. For symmetric encryption to work, the two parties to an exchange must . 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..