Blue enrolled in the University of Georgia, where he played for coach Mark Richt's Georgia Bulldogs football team from 2001 to 2005. While attending Georgia, he registered 176 of his 260 career tackles, eleven of his thirteen quarterback pressures and all 7.5 of his stops behind the line of scrimmage during his last two seasons. Blue was part of a graduating class that earned 44 victories, the most by any senior class in Georgia history. He was redshirted as a freshman in 2001. In 2002, he played as a reserve safety, appearing in every game. He finished with 42 tackles and a pass deflection. He was part of a defense that finished first in the Southeastern Conference (SEC) and fourth nationally in scoring defense (15.1 ppg), first in the SEC in red zone defense (58.8%), second in the SEC and 19th nationally in rushing defense (114.0 ypg), fourth in the SEC and 15th nationally in total defense (303.5 ypg), and allowed only 30 total second half points in the final seven games of the season.