ABSTRACT: This program is a general purpose fast encryption routine that will perform "in-place" encryption on any type of file. Unlike most encryption programs there is no restriction on file type, record length, file size, or text verses data. This program will encrypt anything as long as there is enough virtual memory to load the file. A benefit of encrypting the file in memory is that the encryption is quite fast. The program is designed to be envoked by DCL, and effectively replaces the ENCRYPT command supplied by Digital. However, the encryption algorithm could be easily extracted from the program and used as to perform in line encryption from a user written program. The program has the same functionality as Digital's command, including the ability to encrypt a list of files in the one command. Version X01-02 has a minor bug fix and has had the code standardized.