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CRYPTOGRAPHY & NETWORK SECURITY- Cryptographic Hash Functions
The document discusses cryptographic hash functions and their applications in internet security, focusing on message authentication methods and key management techniques. It covers the principles of cryptographic hash functions, including their types and functionalities, as well as topics related to digital signatures and public key infrastructure. Additionally, it offers resources for further learning and addresses common security challenges businesses face.
CRYPTOGRAPHY & NETWORK SECURITY- Cryptographic Hash Functions
- 1. CRYPTOGRAPHY & NETWORK SECURITY-Cryptographic Hash Functions Dr R Jegadeesan Prof-CSE Jyothishmathi Institute of Technology and Science, karimnagar
- 2. Cryptographic Hash Functions Syllabus ➢UNIT– III: Cryptographic Hash Functions: Message Authentication, Secure Hash Algorithm (SHA-512), Message authentication codes: Authentication requirements, HMAC, CMAC, Digital signatures, Elgamal Digital Signature Scheme. Key Management and Distribution: Symmetric Key Distribution Using Symmetric & Asymmetric Encryption, Distribution of Public Keys, Kerberos, X.509 Authentication Service, Public – Key Infrastructure Security Introduction 2
- 3. Cryptographic Hash Functions Aim& Objective : ➢ Our focus is on Internet Security ➢ Consists of message authentication code ➢UNIT – III: Cryptographic Hash Functions: Message Authentication, Secure Hash Algorithm (SHA-512), Message authentication codes: Authentication requirements, HMAC, CMAC, Digital signatures, Elgamal Digital Signature Scheme. Key Management and Distribution: Symmetric Key Distribution Using Symmetric & Asymmetric Encryption, Distribution of Public Keys, Kerberos, X.509 Authentication Service, Public – Key Infrastructure Security Introduction 3
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- 5. Message Authentication It isa mechanism or service used to verify the integrity of a message. Procedure to verify that - Received message is from alleged source. - Message has not been altered. - There is no change in message sequence. - Message is not delayed or a replay. Cryptographic Hash Functions
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- 8. Message Authentication Functions •Any message authentication or digital signature mechanism has two levels of functionality. • At the lower level, there must be some sort of function that produces an authenticator: a value to be used to authenticate a message. • This lower-level function is then used as a primitive in a higher-level authentication protocol that enables a receiver to verify the authenticity of a message. Cryptographic Hash Functions
- 9. Types of MessageAuthentication Functions The types of functions that may be used to produce an authenticator. These may be grouped into three classes. • Message encryption: The cipher text of the entire message serves as its authenticator. • Message authentication code (MAC): A function of the message and a secret key that produces a fixed- length value that serves as the authenticator. • Hash function: A function that maps a message of any length into a fixed length hash value, which serves as the authenticator. Cryptographic Hash Functions
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- 23. Hash Function courses 23 coursesavailable on <www.coursera.org>, and http://neat.aicte-india.org https://www.coursera.org/ Course 1 : Introduction to Cyber Security Cyber Security. An introduction to modern information and system protection technology and methods. Course 2: Cyber security Specialization -Cyber security Fundamentals. Construction of Secure Systems Cryptographic Hash Functions
- 24. Security Tutorials 24 Tutorial topicwise ➢Cryptography Tutorial – Tutorialspoint www.tutorialspoint.com › cryptography ➢Cryptography Introduction – GeeksforGeeks www.geeksforgeeks.org › cryptography-introduction ➢www.cse.iitm.ac.in › ~chester › courses › slides › 01_Introduction Cryptographic Hash Functions
- 25. Network Security MCQs 25 CNS– MCQs 1.ECB stands for a. Electronic Control Book b. Electronic Code Book c. Electronic Cipher Book d. Electronic Cryptography Book 2.The process of transforming plain text to unreadable text. a. Decryption b. Encryption c. Network Security d. Information Hiding 3.Plain text is the data after encryption is performed. a. True b. False c. May be d. Can't say 4.Study of creating a d using encryption and decryption techniques. a. Cipher b. Cryptography b. c. Encryption d. Decryption 5. An attack in which the user receives unwanted amount of e-mails. a. Smurfing b. Denial of service c. E-mail bombing d. Ping storm Cryptographic Hash Functions
- 26. Security Tutorial 26 CNS –TutorialProblems: ❑There are many businesses that don’t have a complete inventory of all of the IT assets that they have tied into their network. This is a massive problem. If you don’t know what all of the assets are on your network, how can you be sure your network is secure? ❑Many businesses are concerned with “zero day” exploits. These exploits are those unknown issues with security in programs and systems that have yet to be used against anyone. However, zero day vulnerabilities aren’t the problem—unpatched known vulnerabilities are the problem. Cryptographic Hash Functions
- 27. CNS Questions 27 Universities &Important Questions: 1. Differentiate MAC and Hash function. 2. Define hash function. 3. What is a Message Authentication Code (MAC)? 4. Define weak-collision resistance. 5. Define strong-collision resistance 6. Define digital Signature. 7. What is the difference between direct and arbitrated digital signature? 8. What is the role of a Key Distribution Centre (KDC) for user authentication? 9. What is the role of a nonce while using an authentication protocol? 10. What is called public key certificate? Cryptographic Hash Functions
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