[1] Homomorphic cryptography (Tsirozidis)
[2] SSO protocols (Tasos Papadopoulos)
[3] Integer multiplication algorithms (Asimakis Kydros)
[4] Introduction to XSS attacs (Neron Panagiotopoulos) [in Greek]
[5] DDoS Attacks (Stefanos Anastasiades)
[6] Visual Cryptography (Myrto Eleftheria Gkogkou)