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