The aim of this text is to treat selected topics of the subject of contemporary cryptology, structured in five quite independent but related themes: Efficient distributed computation modulo a shared secret, multiparty computation, modern cryptography, provable security for public key schemes, and efficient and secure public-key cryptosystems.

Efficient Distributed Computation Modulo a Shared Secret.- Multiparty Computation, an Introduction.- Foundations of Modern Cryptography.- Provable Security for Public Key Schemes.- Efficient and Secure Public-Key Cryptosystems.