Highly recommended:

• Douglas R. Stinson: Cryptography: Theory and Practice. 2nd Edition, Chapman & Hall/CRC 2002

Also worth reading:

• Ian Parberry: Speakers Guide for theoretical computer science.

Recommended reading on academic integrity, plagiarism and copyright

• Code of Academic Integrity (Cornell University)
• Aufdeckung von Plagiaten (FHTW Berlin)
• Missverständnisse zum Urheberrecht