Indiana Apostle Index Card is a card issued by the Indiana Secretary of State’s office to authenticate and legalize documents for international use. It is generally used for documents such as diploma, birth, marriage, or death certificates that require authentication for use in foreign countries. There are two types of Indiana Apostle Index Card: the Apostle Index Card and the Notary Index Card. The Apostle Index Card is for documents that require an Apostle authentication, and the Notary Index Card is for documents requiring notarization. Both types of index card provide a unique ID number and a signature and seal from the Indiana Secretary of State’s office.