This volume is designed to enable developers to use The OpenSSL library more effectively. It offers guidance on avoiding pitfalls, while taking advantage of the library's advanced features and provides the information necessary to use OpenSSL safely and effectively. In step-by-step fashion, the book details the challenges in securing network communications, and shows you how to use OpenSSL tools to best meet those challenges. System and network administrator should benefit from the thorough treatment of the OpenSSL command-line interface, as well as from step-by-step directions for obtaining certificates and setting up certification authority. Developer should benefit from the in-depth discussions and examples of how to use OpenSSL in their own programs. Although OpenSSL is written in C, information on how to use OpenSSL with Perl, Python and PHP is also included.