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Kerberos is a network authentication protocol developed at MIT to provide encryption for client/server functions. The team at the HPCMPmaintains an internally developed, adapted version of an older MIT Kerberos release for user access via the network to the HPCMP supercomputers.The HPCMP has re-baselined the HPCMP Kerberos to the most current MIT Kerberos release, and has incorporated HPCMP unique functionalityas Kerberos plugins. These plugins include Yubikey authentication, PIPE credential caching, and support for DoD X.509 certificates. Throughputtesting was required to determine if file transfer speeds improved with the pre-release production kit. Throughput performance was measuredon a variety of operating systems employed by HPC users.