This document discusses encryption and secure communication. It explains that encryption encodes messages using algorithms and keys so that only authorized parties can decode it, preventing unauthorized access. The two main types of encryption algorithms are symmetric, for sending information, and asymmetric, for sending both information and keys. Standards like ISO/IEC 27001 provide requirements for establishing and maintaining an effective information security management system to address risks through controls like encryption. PECB offers training and certification services related to ISO standards to help organizations securely implement management systems.