LEADING THE DAY: The Defense Department released its cyber security plan Thursday, revealing a plan that emphasizes defense over retaliation, The Washington Post reported. The department’s plan will use sensors and software to detect attempted attacks before they affect operations.

The plan drew criticism from the nation’s second-ranking military official, vice chairman of the Joint Chiefs of Staff Gen. James Cartwright and security experts, who said it is too defensive.

On Capitol Hill, Rep. Jim Langevin (D-R.I.), co-founder of the Congressional Cybersecurity Caucus, called the plan a good start, but said it needed to better define what constitutes a cyber attack.

24,000 files hacked at Pentagon: In the speech introducing the cyber security plan, Deputy Defense Secretary William J. Lynn III disclosed that “foreign intruders” had accessed 24,000 Pentagon files in March.

Lynn indentified neither where the intruders were fromnor what kinds of files were accessed. He did, however, admit that many files had been stolen from corporate networks of defense companies in the past few years, ranging from mundane data to information about U.S. technology and security systems.

Spectrum hearing: The House Energy and Commerce subcommittee on communications and technology will hold a spectrum hearing Friday on the draft bill Republicans circulated earlier this week.

On Thursday, Reps. Anna Eshoo (D-Calif.) and Henry Waxman (D-Calif.) offered a Democratic spectrum bill that offers some protections for broadcasters, saying that the FCC cannot force them to move from UHF to VHF frequencies and must compensate for some relocations costs. It also includes a provision saying that the FCC may evaluate whether a spectrum sale adversely affects the public interest or gives the buyer an unfair advantage.

FBI opens phone hacking inquiry: The FBI has opened an investigation into allegations that News Corp. employees in the UK tried to intercept voicemail messages from victims of the Sept. 11 attacks, The Washington Post reported. The employees are also accused of trying to bribe law enforcement officials for information.

Officials said that lawmakers’ calls for investigations into whether the employees had violated the rights of Americans prompted the investigation.

Rebekah Brooks, who was the editor of the now-defunct News of the World publication, resigned her current position as News Corp’s British chief executive in Friday, The Washington Post reported.

Lawmakers push for children’s privacy bill: Rep. Anna Eshoo (D-Calif.) said Thursday that Congress should make protecting children online its first Web privacy priority, The Washington Post reported.The Federal Trade Commission is looking into updating privacy law for children, particularly for teenagers.

Federal Communications Chairman Julius Genachowski and White House telecom advisers said they support greater online protections for children, but did not say whether they support or oppose the “kids’ do not track” bill proposed by Reps. Ed Markey (D-Mass.) and Joe Barton (R-Tex.).

Groupon amends IPO: Groupon made some changes to its S-1 IPO filing to address comments made by Chairman Eric Lefkofsky in June. Lefkofsky told Bloomberg that the IPO will be “wildly profitable,” which raised questions about whether or not Groupon had violated its quiet period.

In the updated document, Groupon said that Lefkofsky’s statement did not “accurately or completely” represent his views and that the chairman had asked that his comments not be printed.

Google Q2, Google and memory: Google posted a record $9 billion in revenue for the second-quarter Thursday, a 32 percent increase over the same period last year. Google CEO Larry Page said that he was pleased with the company’s performance and also dropped the statistic that the company’s new social network already had 10 million users.

Google also came up in a new study from Columbia University, which showed that search engines may be affecting the way our brains remember information, The Washington Post reported. The study from psychologist Betsy Sparrow showed that study participants often forgot things they knew they could find on the Internet.

“We remember less through knowing information itself than by knowing where the information can be found,” Sparrow said in a release.