San Diego-based Anonymizer, which develops software and services for anonymous web surfing, has been acquired by Abraxas, a provider of technology for the federal government and national security. Financial terms of the deal were not disclosed. According to Abraxas, Lance Cottrell, founder and CTO of Anonymizer, will become Chief Scientist for the firm. Anonymizer's software allows users to surf the Internet without giving up personal information or details of user browsers, IP addresses, or location, in addition to screening for spyware and spam. In addition, the firm provides services to the government to mask the source of Internet queries; the firm says that its services are used by government agencies to mask undercover investigations, counter intelligence, and for information assurance and cyber security.