Academic Year:  2019/0 
Owning Department/School:  Department of Computer Science 
Credits:  6 [equivalent to 12 CATS credits] 
Notional Study Hours:  120 
Level:  Honours (FHEQ level 6) 
Period: 
 Semester 2

Assessment Summary:
 EXTH 100%* 
Assessment Detail: 
 Open Book Examination of 24 hours duration* (EXTH 100%)
*Assessment updated due to Covid19 disruptions 
Supplementary Assessment: 
 Likeforlike reassessment (where allowed by programme regulations)

Requisites: 
Before taking this module you must ( take CM10227 OR take XX10190 ) AND ( take 2 MODULES FROM {CM10196, CM20217} OR take MA10209 )
An elementary knowledge of number theory, as in chapters 12 of Davenport The Higher Arithmetic, is required to take this unit.

Description:
 Aims: To introduce students to the techniques, tools and pitfalls of cryptography (including authentication etc.).
Learning Outcomes: 1. Students will understand the basic mathematics behind privatekey and publickey cryptography;
2. Students will be able to describe several wellknown techniques for cryptographic security and authentication.
Skills: Application of Number (T/F, A), Problem Solving (T/F).
Content: Introduction to the problem: security, privacy, authentication, repudiation, revocation. The key distribution problem: public vs private keys. The mathematics of cryptography: FermatEuler Theorem, structure of finite fields and elliptic curves. Cryptographic algorithms: DiffieHellman, RSA, ElGamal. Cryptanalysis: discrete logarithms, factoring. The Coppersmith attack. Elliptic Curve analogues. Privatekey algorithms: DES, 3DES and AES. Common hashing algorithms: MD5, SHA1. Characteristics of safe keys.
Using cryptography: digital signatures: how to find the public key.Repudiation and revocation, examples in practice: PGP, digital certificates.

Programme availability: 
CM30173 is Optional on the following programmes:
Department of Computer Science
 USCMAFB06 : BSc(Hons) Computer Science (Year 3)
 USCMAAB07 : BSc(Hons) Computer Science with Study year abroad (Year 4)
 USCMAKB07 : BSc(Hons) Computer Science with Year long work placement (Year 4)
 USCMAFB20 : BSc(Hons) Computer Science and Mathematics (Year 3)
 USCMAAB20 : BSc(Hons) Computer Science and Mathematics with Study year abroad (Year 4)
 USCMAKB20 : BSc(Hons) Computer Science and Mathematics with Year long work placement (Year 4)
 USCMAFM01 : MComp(Hons) Computer Science (Year 3)
 USCMAAM02 : MComp(Hons) Computer Science with Study year abroad (Year 3)
 USCMAKM02 : MComp(Hons) Computer Science with Year long work placement (Year 3)
 USCMAFM14 : MComp(Hons) Computer Science and Mathematics (Year 3)
 USCMAAM14 : MComp(Hons) Computer Science and Mathematics with Study year abroad (Year 3)
 USCMAKM14 : MComp(Hons) Computer Science and Mathematics with Year long work placement (Year 3)
Department of Mathematical Sciences
 TSMAAFM08 : MSc Modern Applications of Mathematics
 USMAAFB15 : BSc(Hons) Mathematical Sciences (Year 3)
 USMAAAB16 : BSc(Hons) Mathematical Sciences with Study year abroad (Year 4)
 USMAAKB16 : BSc(Hons) Mathematical Sciences with Year long work placement (Year 4)
 USMAAFB13 : BSc(Hons) Mathematics (Year 3)
 USMAAAB14 : BSc(Hons) Mathematics with Study year abroad (Year 4)
 USMAAKB14 : BSc(Hons) Mathematics with Year long work placement (Year 4)
 USMAAFB01 : BSc(Hons) Mathematics and Statistics (Year 3)
 USMAAAB02 : BSc(Hons) Mathematics and Statistics with Study year abroad (Year 4)
 USMAAKB02 : BSc(Hons) Mathematics and Statistics with Year long work placement (Year 4)
 USMAAFB05 : BSc(Hons) Statistics (Year 3)
 USMAAAB06 : BSc(Hons) Statistics with Study year abroad (Year 4)
 USMAAKB06 : BSc(Hons) Statistics with Year long work placement (Year 4)
 USMAAFM14 : MMath(Hons) Mathematics (Year 3)
 USMAAFM14 : MMath(Hons) Mathematics (Year 4)
 USMAAAM15 : MMath(Hons) Mathematics with Study year abroad (Year 4)
 USMAAKM15 : MMath(Hons) Mathematics with Year long work placement (Year 4)
 USMAAKM15 : MMath(Hons) Mathematics with Year long work placement (Year 5)
