Security Dynamics Inc, Cambridge, Massachusetts, has some new security software for networked Unix systems. ACE/Server provides access control and security administration on Ethernet-TCP/IP networks. It is available initially on Sun Microsystems Inc and Digital Equipment Corp Unix systems, and other releases are planned before the end of the year. It supports MS-DOS personal computers and Apple Macintoshes, as well as Sun and DEC workstations, as clients. The password system is based upon a liquid crystal display-based user identification card – the SecureID Card – which changes the encryption process every 60 seconds, making systematic code-breaking difficult. Prices start at $5,000 for a 16-client package, while $10,000 would buy a 100-user set-up.