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This is part of the Mandos system for allowing computers to have
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encrypted root file systems and also be capable of remote and
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unattended reboots. The computers run a small client program in the
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initial RAM disk environment which will communicate with a server
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over a network. The clients are identified by the server using a
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OpenPGP key; each client has one unique to it. The server sends the
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clients an encrypted password. The encrypted password is decrypted
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by the clients using the same OpenPGP key, and the password is then
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used to unlock the root file system, whereupon the computers can
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continue booting normally.