Security of data by means of cryptography is becoming more and more important in many areas of our lives. Public-key cryptosystems (PKC) form an important part of cryptography as they allow con-venient and secure communication between all users. The objective is to develop PKCs that provide a high level of security while being fast and easy to use. The author Robert Niebuhr analyses the application of Algebraic-Geometric Codes (AGC) in Cryptographic Systems. Start-ing with a brief discussion of Algebraic Geometry and the general construction of PKCs, he shows how to use AGC including...