A 24-year-old University of Nebraska-Lincoln student faces a felony charge, accused of hacking into his ex-girlfriend's UNL account.

The incident has led the university to change its computer system's security.

Reports say that graduate student Mauricio Martinez Eusso guessed the answers to his former girlfriend's password questions. Police say he then changed her password and dropped her from three courses for which she had registered.

Martinez has been charged with unauthorized computer access causing damage.

Police say it took Martinez fewer than 10 guesses -- the most the system allows -- to correctly answer the woman's password questions.

University officials say users will be allowed five attempts before the account is locked.