Associated with the provision and operation of a Trusted Third Party (TTP) are a number of security-related issues for which general guidance is necessary to assist business entities@ developers and providers of systems and services@ etc. This includes guidance on issues regarding the roles@ positions and relationships of TTPs and the entities using TTP services@ the generic security requirements@ who should provide what type of security@ what the possible security solutions are@ and the operational use and management of TTP service security. This Recommendation | Technical Report provides guidance for the use and management of TTPs@ a clear definition of the basic duties and services provided@ their description and their purpose@ and the roles and liabilities of TTPs and entities using their services. It is intended primarily for system managers@ developers@ TTP operators and enterprise users to select those TTP services needed for particular requirements@ their subsequent management@ use and operational deployment@ and the establishment of a Security Policy within a TTP. It is not intended to be used as a basis for a formal assessment of a TTP or a comparison of TTPs. This Recommendation | Technical Report identifies different major categories of TTP services including: time stamping@ non-repudiation@ key management@ certificate management@ and electronic notary public. Each of these major categories consists of several services which logically belong together.