Insiders are responsible for as much as 80 percent of malicious attacks. Because insiders are trusted by nature, detecting their illicit activities requires an array of monitoring, scanning, and other techniques. Roger Grimes, an InfoWorld contributing editor -- and a working security professional who tracks down unscrupulous insiders -- explains how to plan and execute a complete insider threat strategy.

A former security guard has pleaded guilty to charges that he broke into his employer's computers while working the night shift at a Dallas hospital.

An employee of the U.S. Department of State was sentenced Wednesday to 12 months of probation for illegally accessing more than 125 electronic passport application files, the U.S. Department of Justice said.

Microsoft has settled a lawsuit with a former employee that it once charged with fraud, misappropriation of trade secrets and breach of contract.

Workers at T-Mobile UK have been selling customer data to brokers who work for the competition, T-Mobile and the U.K.'s Information Commissioner's Office said on Tuesday.

An eighth person who has worked for the U.S. Department of State has pleaded guilty to illegally accessing numerous electronic passport files that are supposed to be confidential, the U.S. Department of Justice said.

On the night of April 27, 2009, hours after he had resigned from his job as an auditor at the California Water Services Company, Abdirahman Ismail Abdi used his still active electronic key card to get into the secured facilities where he used to work.

A former IT analyst at the Federal Reserve Bank of New York and his brother were arrested Friday on charges that they took out loans using stolen information, including sensitive information belonging to federal employees at the bank.