Skip to Content [alt-c]


In reply to STARTTLS Considered Harmful

Reader Charles on 2014-08-13 at 11:41:

thanks. Very interesting. One question: how can a client protect itself against a TLS downgrade attack? How can it tell the difference between an SMTP server that has TLS but with a man in the middle and an SMTP server with no TLS?


Post a Reply

Your comment will be public. To contact me privately, email me. Please keep your comment polite, on-topic, and comprehensible. Your comment may be held for moderation before being published.

(Optional; will be published)

(Optional; will not be published)

(Optional; will be published)

  • Blank lines separate paragraphs.
  • Lines starting with > are indented as block quotes.
  • Lines starting with two spaces are reproduced verbatim (good for code).
  • Text surrounded by *asterisks* is italicized.
  • Text surrounded by `back ticks` is monospaced.
  • URLs are turned into links.
  • Use the Preview button to check your formatting.