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