LEADING THE DAY: Federal Chief Information Officer Vivek Kundra announced that he will leave his position in mid-August for a fellowship at Harvard University, said Office of Management and Budget director Jack Lew in an statement Thursday.

Kundra, who was appointed as the first federal CIO in 2009, will be a joint fellow at Harvard’s Kennedy School of Government and the Berkman Center for Internet and Society. Kundra’s resignation was first reported by Politico’s Kim Hart. Lew said the office is planning for “a smooth transition” and will continue to build on Kundra’s work.

LulzSec targets CIA: Hacker group LulzSec took credit for a denial of service attack on the CIA’s Web site, The Washington Post reported. The group posted a message on Twitter taking credit for the attack at 5:48 p.m. The site was back up by 8 p.m.

It’s the latest in a string of attacks the group has carried out to embarrass institutions by exposing their security weaknesses. LulzSec has also hacked the Web sites of PBS, Sony and the Atlanta branch of FBI-affiliated security firm InfraGard. It also carried out several denial of service attacks earlier this week, taking requests for places to target.

When asked about the denial of service attack, CIA spokeswoman Marie Harf told The Post that the agency is “looking into these reports.”

Citigroup says breach hit more than 300,000:Citigroup released more details about a hacking attack that led to a breach of customer information on May 10. According to a Citigroup spokesperson, 360,083 accounts were breached, though only 217,657 of the accounts had current information. Only customers who opened their accounts in the U.S. were affected, including 834 people in D.C., 5,041 in Maryland and 5,337 in Virginia.

The company first publicly acknowledged the attack on June 9, The Washington Post reported.

T-Mobile’s James Russo keeps lobbying off the links: T-Mobile lobbyist James Russo does his best not to mix business and golf, The Washington Post reported, despite the famous names that pop up in his foursomes. Although Russo plays golf with influential names such as Sen. Roy Blunt (R-Mo.), CTIA president and CEO Steve Largent and Vice President Joe Biden, he said he prefers to focus on the game.

Tests confirm LightSquared could interfere with GPS: Preliminary tests indicate that higher frequencies allotted to LightSquared for its satellite and ground broadband network could interfere with GPS signals, The Los Angeles Times reported. And although LightSquared executive Jeff Carlisle told the newspaper that he believes there are ways both services can coexist, members of the GPS industry say the tests prove otherwise.

An official from the organization overseeing the tests said that the results are inconclusive and that a shift to lower frequencies may be the solution.

The Wall Street Journal reported that LightSquared has gotten approval from its lenders to give Sprint a second spectrum lien that reportedly gives Sprint the ability to take control of the spectrum if LightSquared defaults.

FCC chair says he won’t step in on retrans issues ... yet: In an interview with GigaOm, Federal Communications Commission chairman Julius Genachowski said that while the agency has developed plans to deal with retransmission disagreements, it won’t step in if cable companies and programmers can solve the disputes themselves.

Genachowski also said that the FCC would take steps to encourage “innovation on the TV platform” such as TV apps and continue its work on narrowing the broadband adoption gap.

Taobao splits into three: Taobao, the Chinese e-commerce giant often compared to eBay, is splitting into three separate entities. According to an e-mail from Alibaba Group CEO Jack Ma, the company will separate into a consumer-to-consumer company, a business-to-consumer company and a product search engine, All Things Digital reported.