* Jon Dowland <j...@debian.org>, 2012-11-28, 17:29:
Having just viewed the raw text of my message (as sent), there's one
other little wrinkle which I already knew but had failed to consider
and which makes testing of this useless: gpg handles any 'From ' lines
itself in a reversible manner, using '- ' as the prefix.
Definitely reversible? How does it distinguish 'From ' from '- From'
prior to signing? Ad infinitum down the rabbit hole…
http://tools.ietf.org/html/rfc4880#section-7.1
"Dash-escaped cleartext is the ordinary cleartext where every line
starting with a dash '-' (0x2D) is prefixed by the sequence dash '-'
(0x2D) and space ' ' (0x20). This prevents the parser from recognizing
armor headers of the cleartext itself. An implementation MAY dash-escape
any line, SHOULD dash-escape lines commencing "From" followed by a
space, and MUST dash-escape any line commencing in a dash. The message
digest is computed using the cleartext itself, not the dash-escaped
form."
--
Jakub Wilk
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