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At the point when we change over the seat's trust status to untrusted for the last time, to finish authentication, Plink will now present a final interactive prompt saying 'Press Return to begin session'. This is a hint that anything after that that resembles an auth prompt should be treated with suspicion, because _PuTTY_ thinks it's finished authenticating. This is of course an annoying inconvenience for interactive users, so I've tried to reduce its impact as much as I can. It doesn't happen in GUI PuTTY at all (because the trust sigil system is used instead); it doesn't happen if you use plink -batch (because then the user already knows that they _never_ expect an interactive prompt); and it doesn't happen if Plink's standard input is being redirected from anywhere other than the terminal / console (because then it would be pointless for the server to try to scam passphrases out of the user anyway, since the user isn't in a position to enter one in response to a spoof prompt). So it should only happen to people who are using Plink in a terminal for interactive login purposes, and that's not _really_ what I ever intended Plink to be used for (which is why it's never had any out-of-band control UI like OpenSSH's ~ system). If anyone _still_ doesn't like this new prompt, it can also be turned off using the new -no-antispoof flag, if the user is willing to knowingly assume the risk.