The basic idea for this encryption program was to secure access to Internet pages without using CGI scripts, which have to be stored in a special directory on the web server and cannot always be accessed. This gave me the idea of encrypting the entire page and preparing it so that it can be decrypted with an ordinary browser capable of Java script 1.2. SOS encrypts .html files with the algorithm BC1 that I invented and outputs an html page with the encrypted original page and the decryption routine in Java script.