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Cryptographic primitives:. Public key cryptography for both security and authentication. Indra daemons identified by unique keys generated by admin. Security layer encapsulates cryptographic functions. Cryptographic primitives:. Depends on central key server to certify public keys. Existing PGP key server network may be used. Does not scale well with number of nodes. Web of trust model:. Certain nodes have pre-assigned trust. Trust for new nodes computed using transitive trust relations. Heuristics like maximum flow may be used.