Modifications to the new Close On Exit option:

[u/mdw/putty] / doc / pubkey.but

\C{pubkey} Using public keys for SSH authentication

\# Explain the basic principles of public key authentication. Many
\# people don't have the faintest idea what it is or why it's good.

\# Explain the dangers of leaving an unprotected private key around.
\# Explain passphrases, and urge that people NEVER store
\# unpassphrased keys unless they really need to or they can be sure
\# the machine is secure.

\# Mention a good length for a passphrase. (I think Schneier
\# said something about this on counterpane.com once.)

\# In case people don't like the idea of exchanging a short password
\# typed every time for a longer passphrase typed every time, link
\# to the Pageant chapter.