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is to immediately disable and/or uninstall tools that automatically decrypt PGP-encrypted email. Until the flaws described in the paper are more widely understood and fixed, users should arrange for the use of alternative end-to-end secure channels, such as Signal, and temporarily stop sending and especially reading PGP-encrypted email.
The countermeasure Werner mentions is called a Modification Detection
Code, or MDC. It's been a standard part of GnuPG for almost eighteen
years. For almost all that time, any message which does not have an MDC
attached has caused GnuPG to throw up big, clear, and obvious warning