Lenovo, the world's largest PC manufacturer, promises to stop preinstalling any software on its Windows laptops that doesn't need to be there. The move comes following security alerts relating to the Superfish adware the company had been preinstalling.

SIM card manufacturer Gemalto says its investigation into a reported U.S. and U.K. intelligence agency espionage operation found that its internal networks housing encryption keys weren't breached. But security experts question those findings.

Hackers have been stealing the secret trading algorithms that are the lifeblood of many hedge funds and high-frequency trading firms, according to two security companies. What can be done to mitigate the risks?

The hacking group Lizard Squad has claimed credit for hijacking the website of Lenovo.com and redirecting visitors to an attacker-controlled site. It also indicates that it's now sitting on a cache of stolen Lenovo e-mail messages.

Manufacturers of PCs and mobile devices must end the practice of preloading "bloatware." Lenovo's experience with offering "free" adware shows the hidden security and performance tradeoffs buyers must endure.