Wikipedia defines phishing as "a form of social engineering, characterised by attempts to fraudulently acquire sensitive information, such as passwords and credit card details, by masquerading as a trustworthy person or business in an apparently official electronic communication, such as an email or an instant message. The term phishing arises from the use of increasingly sophisticated lures to "fish" for users' financial information and passwords."
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Anti-Phishing Working Group
Cross-industry global group supporting those tackling the phishing menace. Provides advice on anti-phishing controls and information on current trends.
Bank Safe Online
Advice from a UK banking industry group about phishing, money mules and Trojans.
Better Business Bureau
Consumer advice on how to avoid and report phishing attacks.
Green Armor Solutions
Sells Identity Cues software to help users recognize fake websites through visual reminders linked to user login details.
Advice from the US Federal Trade Commission on how to spot, avoid and report phishing attacks and other forms of identity theft (fraud). Free awareness videos.
Site Advisor anti-phishing toolbar plus free limited-functionality version.
Browser toolbar to report and block phishing sites identified by the toolbar user community. Identifies in which countries websites are hosted as further clues to their authenticity.
Provides general phishing information and prevention tips.
Clearing house for information on phishing sites reported by the public plus an open API to integrate the data into anti-phishing applications.
Archive of tens of thousands of scam emails in five categories, with advice on avoidance and reporting.
Spoof Email Tutorial
Explains how scammers trick people into thinking they're being contacted by eBay.
US-CERT Cyber Security Tip on Preventing and Responding to Identity Theft
Straightforward advice for those who fall prey to phishing and similar attacks.
Explains common phishing methods and dangers. Lots of references.