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In this paper, the authors consider the problem of how entities operating under distinct roots of trust in a coalition environment can flexibly and securely communicate with one another. They consider the identity-based setting, with each entity being pre-configured with a private key from a particular Trusted Authority (TA), but where multiple, independent TAs are involved in the coalition. Their solution to the problem adapts the Boneh-Franklin Identity-Based Encryption (IBE) scheme. It allows any entity to securely communicate with any other entity, even without knowing the TA with which the intended recipient is associated.
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