Pope Benedict named the members of a papal commission he established in March to investigate a series of leaks of letters exchanged among Vatican officials and between the officials and the pope himself.
Spanish Cardinal Julian Herranz, 82, a former president of the Pontifical Council for the Interpretation of Legislative Texts, will lead the commission.
The two other members are 88-year-old Slovakian Cardinal Jozef Tomko, prefect emeritus of the Congregation for the Evangelization of Peoples; and the retired archbishop of Palermo, Cardinal Salvatore De Giorgi, 81.
The commission of cardinals "will act at all levels on the strength of its pontifical mandate" to investigate the "recent leaks of reserved and confidential documents on television, in newspapers and in other communications media," said a Vatican press release April 25.
While some of the leaked letters are gossipy, others include allegations of serious financial misconduct.