A TTP (Trusted Third Party) is tasked with assuring specific security characteristics within a cloud environment, while realizing a trust mesh between involved entities, forming federations of clouds. The solution, presents a horizontal
level of service, available to all implicated entities, that realizes a security mesh, within which essential trust is maintained. This approach makes use of a combination of Public Key Cryptography, Single-Sign-On technology and
LDAP directories to securely identify and authenticate implicated entities. The model presented in this paper offers the advantages of each single technology used and deals with their deficiencies through their combined implementation.