HAMBURG, Germany (Reuters) - A Moroccan accused of helping the September 11 suicide hijackers received training in encryption techniques at an al Qaeda camp in Iran in 1997, an Iranian defector said on Friday. But his testimony to a German court was promptly undercut by comments from Germany's intelligence services, who questioned his credibility and said his evidence was worth very little. Hamid Reza Zakeri, the cover name of a man who says he worked in Iranian intelligence and defected in 2001, was testifying toward the end of Germany's second major trial of suspected members of al Qaeda's Hamburg cell....