Confira este link. link . As informações no site podem ajudá-lo.
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Pode usar o cryptsetup. Veja man cryptsetup
:
TCRYPT (TrueCrypt-compatible) EXTENSION
cryptsetup supports mapping of TrueCrypt or tcplay encrypted partition
using a native Linux kernel API. Header formatting and TCRYPT header
change is not supported, cryptsetup never changes TCRYPT header on-
device.
...
open --type tcrypt <device> <name>
tcryptOpen <device> <name> (old syntax)
Opens the TCRYPT (a TrueCrypt-compatible) <device> and sets up a
mapping <name>.
<options> can be [--key-file, --tcrypt-hidden, --tcrypt-system,
--readonly, --test-passphrase].