# Cryptography (V2/Ü1)

The information on this website is also available in the Lehr- und Lernportal der RWTH Aachen. Every participant should sign up there.

## Links to Campus Office

## Contents

- Classical cryptosystems
- Cryptanalysis of classical systems
- Entropy and perfect secrecy
- Fast block ciphers
- Number theoretic reference problems
- Cryptosystems based on discrete logarithms
- Public key cryptography

## Prerequisites

Basic knowledge in stochastics and number theory.

## Literature

**Our lecture notes for Cryptography & Advanced Methods of Cryptography.**- Handbook of Applied Cryptography by Menezes, van Oorschot and Vanstone.
- Lecture notes of the lecture Stochastik für Informatiker by R. Mathar.
- The book Informationstheorie by R. Mathar.
- Complete list of the bibliography.

## Help-sheet

- Help-sheet for Cryptography (english version only)

## Pocket Calculator

While taking the written exam, you are allowed to use a pocket calculator from this list.## Exercises

- Exercise 1 – Solution
- Exercise 2 – Solution
- Exercise 3 – Ciphertext – Solution
- Exercise 4 – Solution
- Exercise 5 – Solution
- Exercise 6 – Solution
- Exercise 7 – Solution
- Exercise 8 – Solution
- Exercise 9 – Solution
- Exercise 10 – Solution
- Exercise 11 – Solution
- Review – Solution

## Information about the Exam

- Review exercise (Zusatzübung) (04.08.15, 2:00PM, ICT-Cubes, room 333).
- Extra consultation hour (Sprechstunde) (11.08.15, 10:00AM, ICT-Cubes, room 333).
- The exam on Cryptography 1 begins at 8:30h in the room 1515|002 and lasts 90 minutes. During the exam you are allowed to use a pocket-calculator that is enlisted in the list above. We will distribute the official help sheet (English version) at the beginning of the exam.
- The results of the exam are now online. The access codes are found on the information sheets distributed during the exam.
- Exam inspection (Klausur-Einsicht) (25.08.15, 10:00AM, ICT-Cubes, room 333)

## Consultation hour

Dr.-Ing. Henning Maier upon agreement

M.Sc. Jose Angel Leon Calvo upon agreement

Prof. Dr. R. Mathar upon agreement