@node Precautions
@unnumbered Precautions

@enumerate
@item
We use passphrase authentication, so overall security fully depends on
its strength. You @strong{should} use long, high-entropy passphrases.
Also remember to keep passphrase in temporary file and read it securely
as described in @ref{Verifier, verifier}.

@item
You must @strong{never} use the same key for multiple clients.

@item
You must use @strong{cryptographically good} pseudo random number
generator. By default we use default @code{crypto/rand} library that
reads @file{/dev/urandom} source. Some GNU/Linux and FreeBSD systems
are rather good with this entropy source. Closed proprietary ones are
always not and you must use optional @ref{EGD} feature with them.
@end enumerate