# Current students

During 2021 we will continue to support students who need to study remotely due to the ongoing impacts of COVID-19 and travel restrictions. Make sure you check the location code when selecting a unit outline or choosing your units of study in Sydney Student. Find out more about what these codes mean. Both remote and on-campus locations have the same learning activities and assessments, however teaching staff may vary. More information about face-to-face teaching and assessment arrangements for each unit will be provided on Canvas.

Unit of study_

# MATH2088: Number Theory and Cryptography

Cryptography is the branch of mathematics that provides the techniques for confidential exchange of information sent via possibly insecure channels. This unit introduces the tools from elementary number theory that are needed to understand the mathematics underlying the most commonly used modern public key cryptosystems. Topics include the Euclidean Algorithm, Fermat's Little Theorem, the Chinese Remainder Theorem, Mobius Inversion, the RSA Cryptosystem, the Elgamal Cryptosystem and the Diffie-Hellman Protocol. Issues of computational complexity are also discussed.

Code MATH2088 Mathematics and Statistics Academic Operations 6
 Prerequisites: ? MATH1002 or MATH1902 or MATH1004 or MATH1904 or MATH1064 or (a mark of 65 or above in MATH1014) None MATH2068 or MATH2988

At the completion of this unit, you should be able to:

• LO1. understand and use the basic terminology of number theory and cryptography
• LO2. carry out simple number-theoretic computations either with a calculator or using MAGMA
• LO3. apply standard number-theoretic algorithms
• LO4. understand and use some classical and number-theoretic cryptosystems
• LO5. apply standard methods to attack some classical cryptosystems
• LO6. understand the theory underlying number-theoretic algorithms and cryptosystems, including the general properties of primes, prime factorisation, modular arithmetic, divisors and multiplicative functions, powers and discrete logarithms.

## Unit outlines

Unit outlines will be available 2 weeks before the first day of teaching for the relevant session.