U.S. authorities have arrested a second member of the hacking group known as LulzSec in connection with a cyber attack against Sony Pictures Entertainment that saw the leaking of thousands of emails, phone numbers, passwords and other personal details of people who had entered Sony contests.

(Reuters) – Frustrated by their inability to stop sophisticated hacking attacks or use the law to punish their assailants, an increasing number of U.S. companies are taking retaliatory action. Known in the cyber security industry as “active defense” or “strike-back” technology, the reprisals range from modest steps to distract and delay a hacker to more controversial measures.