Electronic Communication Investigate

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Electronic Communication Investigate Josh Lockyer Period 4

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Chapter 14 Internet Services and Email Chapter 14 Overview Fundamentals of internet service, notably email Email formatting and transmission Email security issues Enterprise firewalling and point of presence Internet Services Software that provides Layer 7 services Not all Layer 7 services are end-user services DNS – name translation for other services DHCP – automated host configuration Traditional internet applications Many Internet applications were developed before security problems became serious Some date to the 1970s Older applications: file transfer (FTP), remote terminals (Telnet), finger protocol Internet Email Email with “@” address dates back to 1971 Developed for ARPANET hosts Two types of Internet standards for email Formatting standards – layout of email messages and how to handle attachments Protocol standards – how to exchange an email message/file between hosts Basic Email Format MIME Formatting “Multipurpose Internet Message Extension” Traditional email contains 7-bit ASCII characters Some email servers erase the eighth bit, or otherwise modify it MIME provides a way to embed non-ASCII encoding in an email message Embeds images or complex documents Formats messages using Web-style markup Includes encrypted data or digital signatures Email Protocols Two Types of Protocols Mailbox protocols – let a client program retrieve email from a server POP3 – a simple and popular protocol IMAP – a more elaborate protocol MAPI – Microsoft's Message API (Exchange) Delivery protocols – transmit an email to another server for delivery to its destination Typically Simple Mail Transfer Protocol: SMTP Tracking an Email: Servers Tracking an Email: Headers Is This Email Genuine? Headers from the Suspect Email Email Security Problems Connection-based attacks Large-scale sniffing risks Many sites use SSL to encrypt email traffic Spam Unsolicited email; often distributes frauds Phishing Email that tries to retrieve authentication data Email viruses Messages that trick user into replicating them Spam, Spam, Spam, Spam, Spam A huge problem Unsolicited email wastes bandwidth, server storage space, server compute cycles Typical spam involves fraudulent or illegal activities, or products not accepted in normal advertising channels Frauds Advance fee fraud Dubious stock investments Spam Prevention and Control Restrict access to mail servers Whitelists – lists of email servers that actively avoid handling spam Blacklists – email servers that carry spam Identify spam by pattern and filter it out Binary matching – looks for an exact match with specific features Statistical matching – calculates likelihood that an email is spam; filters on relative scores Phishing A social engineering attack Email induces the recipient to visit a bogus website and provide login credentials Bogus banking site, ecommerce site, email site, etc. Elements of a phishing attack Spam email that takes users to the bogus site Website that collects .

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