Abstract: A method and apparatus for computer translation between a natural language, such as English, and a second language, such as the command language of a computer operating system, a job control language, a robot control language, a numerical control machine program language or subset of another natural language.The system for an operating system interface performs semantic processing of natural language requests by applying cryptographic techniques and indexes to guide an Artificial Intelligence search and inference mechanism in a mapping process from the user request to the target command set. Other cryptographic characteristics such as frequency distribution of classes of words and letters are used to allocate and retrieve the information in the knowledge base. The system also utilizes a high speed cryptographic filter to reduce computational overhead. A crypto-signature is computed in this filtering process to permit fast and efficient pattern matching access and to interface the virtual memory system.