A court has sentenced Alberto Fujimori to six years in prison after the jailed former president pleaded guilty to authorizing wiretaps and bribes to politicians, journalists and businessmen.

The 71-year-old politician already faces the prospect of spending the rest of his life in prison after a special Supreme Court panel sentenced him to 25 years for crimes against humanity for authorizing military death squads.

Asked if he accepted the sentence Wednesday, the ailing Fujimori stood up and said "I move to nullify."

The court has convicted Fujimori of ordering his former spy chief to secretly wiretap 28 politicians, journalists and businessmen; bribe 13 congressmen, and buy off a TV station and a newspaper editorial board.