Comments (RFCs) Classified Standards EKMS NSA's Electronic Key Management System FNBDT NSA's secure narrow band voice standard Fortezza encryption based on portable crypto token in PC Card format STE secure telephone STU-III older secure telephone TEMPEST prevents compromising emanations Other IPsec Virtual Private Network (VPN) and more IEEE P1363 covers most aspects of public-key cryptography Transport Layer Security (formerly SSL) SSH secure Telnet and more Content Scrambling System (CSS, the DVD encryption standard, broken by DeCSS) Kerberos authentication standard RADIUS authentication standard ANSI X9.59 electronic payment standard Common Criteria Trusted operating system standard CRYPTREC Japanese Government's cryptography recommendations See also Topics in cryptography Technology-related lists