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1 Journal of Applied Computer Science

1 2000

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An innovative distributed identity delegation

Garcia J. Y., Morant Cimas F., Galan L. M., Barcia Vazquez N., Lopez Gomez G.

Journal of Applied Computer Science

2000

Vol. 8, nr 1

7-21

This work concentrates on distributed authorization and describes a procedure based on different protocols that can be applied to address a variety of distributed authorization problems. Such protocols are flexible enough to satisfy the needs of a diverse set of applications. Our authorization procedure includes a new method of absolute identity delegation among processes in distributed systems. This delegation transfers the representation of a user or process in a total way throughout a distributed environment. Taking into account that each principal is identified by its private key, our solution is based on one Authorization Server (AS). The AS stores the secret information, such as private keys, of both intermediate processes and users so that this information will not have to be transmitted over the network. The AS will also execute all those cryptographic operations that require using the private keys. The mentioned procedure makes use of X.500 Directory to store the public keys and Certification Authorities (CAs) to sign the certificates. Delegation in our proposal corresponds to international security standards (ITU-T X.509), both from the point of view of the user and from the point of view of all the services preceeding and following the delegation of identity.