Service continuity for online services 123 Guidelines for Cryptography 127 Cryptographic fundamentals 127 ASD-Approved Cryptographic Algorithms 129 ASD-Approved Cryptographic Protocols 133 Transport Layer Security 134 Secure Shell 135 Secure/Multipurpose Internet Mail Extension 137 Internet Protocol Security 137 Guidelines for Gateways 139 Gateways 139 Cross Domain Solutions 141 Firewalls 143 Diodes 144 Web proxies 144 Web content filters 145 Content filtering 146 Peripheral switches 149 Guidelines for Data Transfers Data transfers Cyber Security Terminology 150 150 153 Glossary of abbreviations 153 Glossary of cyber security terms 157 v