CM30173: CryptographyPart III CM30173: Cryptography Part III Do we know who we are talking to yet? Message digest codes What do we mean by secure? Creating MDCs Iterated hash functions Do we know who we are talking to yet? Message digest codes Creating MDCs Part III Cryptographic hashes CM30173: CryptographyPart III CM30173: Cryptography Part III […]
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Announcements Announcements Exam 2 on Friday Please let me know if you cannot take during class time (and didn’t already tell me for exam 1) No class on Monday Last Time Greedy Algorithms Find decision Procedure Repeatedly make best available choice Repeat until done Exchange arguments Optimal Caching Today Huffman Codes Minimum Spanning Trees Huffman
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CM30173: Cryptography eserved@d =[@let@token art VI CM30173: Cryptography Part VI What is a digital signature? What do we mean by secure? Example: RSA signature scheme Examples of attacks Signatures and hashes Part VI Signature schemes CM30173: Cryptography Part VI What is a digital signature? What do we mean by secure? Example: RSA signature scheme Examples
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CM30173: Cryptography\reserved@d =[@let@token art IV CM30173: Cryptography Part IV Discrete logarithms More mathematics The discrete logarithm problem Di!e-Hellman Man in the middle attack The ElGamal cryptosystem Part V Public-key cryptography CM30173: Cryptography Part IV Discrete logarithms More mathematics The discrete logarithm problem Di!e-Hellman Man in the middle attack The ElGamal cryptosystem Discrete logarithms More mathematics
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1. (a) What is a substitution-permutation network? How is it used to encrypt a block of plaintext? 4 marks for defining iterated block cipher incorporating substitutions, permutations, and mixing of round keys according to a key schedule. Explain how the same encryption algorithm for an SPN can be used for decryption by describing the required
CM30173: Cryptography eserved@d =[@let@token art V CM30173: Cryptography Part V RSA security: all about factoring? Multiplicative properties Common modulus Small private exponent Small public exponent RSA in practice RSA security: all about factoring? RSA in practice Part V Public-key cryptography CM30173: CryptographyPart V CM30173: Cryptography Part IV A family of algorithms Basic idea A framework
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CM30173 University of Bath DEPARTMENT OF COMPUTER SCIENCE EXAMINATION CM30173 May 2010 No calculators may be brought in and used. Full marks will be given for correct answers to THREE questions. Only the best three answers will contribute towards the assessment. Examiners will attach importance to the number of well-answered questions. CM30173 CM30173 2. 1.
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8a: Reinforcement Learning Week 8: Overview The topic for this week is Reinforcement Learning (RL). We will see how reinforcement learning tasks can be formally de�ned, compare di�erent models of optimality, and discuss the need for exploration and the problem of delayed rewards. We will present a number of RL algorithms including Temporal Di�erence learning
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CM30173: Cryptography\reserved@d =[@let@token art IV CM30173: Cryptography Part IV The ElGamal signature scheme Security of the ElGamal signature scheme Careless uses of ElGamal signature scheme A downside of ElGamal ElGamal variants A problem… Part VI Signature schemes CM30173: Cryptography Part IV The ElGamal signature scheme Security of the ElGamal signature scheme Careless uses of ElGamal
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1. (a) Give the definition of a private key encryption system based on a Feistel cipher, including the definition of the encryption function. Describe the decryption function of a Feistel cipher, and show in detail that it is the inverse to encryption. [8] (b) Which feature(s) of the Data Encryption Standard were designed to resist