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Key establishment is the main issue for secure many-to-many communications. We study the problem of large-scale distributed file system, which support parallel access to multiple storage devices. The existing Kerberos-based protocol has a number of limitations: scalability of the protocol is restricted, it provide less forward secrecy, and leads to key escrow. In this paper, we propose a variety of authenticated and encrypted key exchange protocols that are designed to address the above issues.fatcat:baen3malq5anrez2xmikk4lqvu