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Computer, Internet and Network Systems Security

This manual is an effort to assist law enforcement agencies and other computer crime investigators by providing a resource guide compiled from the vast pool of information on the Internet. This manual is not intended to replace any formal training or education. This manual should be used as a supplemental guide to reference too. It was not my intention to compile this manual to provide a specific solution for investigators. This was intended to provide a general overview, which would assist in helping to developing a solution. This solution does not have to be hardware or software based. Today policy-based protection can also be incorporated into hardware and software. | INFORMATION RESOURCE GUIDE__ Computer Internet and Network Systems Security An Introduction to Security i Security Manual Compiled By S.K.PARMAR Cst N.Cowichan Duncan RCMP Det 6060 Canada Ave. Duncan BC 250-748-5522 sunny@seaside.net This publication is for informational purposes only. In no way should this publication by interpreted as offering legal or accounting advice. If legal or other professional advice is needed it is encouraged that you seek it from the appropriate source. All product company names mentioned in this manual are the registered trademarks of their respective owners. The mention of a product or company does not in itself constitute an endorsement. The articles documents publications presentations and white papers referenced and used to compile this manual are copyright protected by the original authors. Please give credit where it is due and obtain permission to use these. All material contained has been used with permission from the original author s or representing agent organization. ii TJecfContert 1.0 INTRODUCTION.2 1.1 Basic Internet Technical Details.2 1.1.1 TCP IP Transmission Control Protocol Internet Protocol.2 1.1.2 UDP User Datagram Protocol.2 1.1.3 Internet Addressing.3 1.1.4 Types of Connections and Connectors.3 1.1.5 Routing.6 1.2 Internet Applications and Protocols.6 1.2.1 archie .6 1.2.2 DNS Domain Name System.7 1.2.3 E-mail Electronic Mail.7 1.2.4 SMTP Simple Mail Transport Protocol.7 1.2.5 PEM Privacy Enhanced Mail.8 1.2.6 Entrust and Entrust-Lite.8 1.2.7 PGP Pretty Good Privacy.8 1.2.8 RIPEM Riordan s Internet Privacy-Enhanced Mail.9 1.2.9 MIME Multipurpose Internet Mail Extensions.9 1.3 File Systems.9 1.3.1 AFS Andrew File system.9 1.3.2 NFS Network File System.9 1.3.3 FTP File Transfer Protocol.10 1.3.4 GOPHER.10 1.3.5 ICMP Internet Control Message Protocol.10 1.3.6 LPD Line Printer Daemon.11 1.3.7 NNTP Network News Transfer Protocol.11 1.3.8 News Readers.11 1.3.9 NIS Network Information Services.11 1.3.10 RPC .