Such new algo, no MDC, messages are supposed to be rare and might be an indication of broken / insecure software or configuration. For messages that were encrypted using modern algorithms but still don't use MDC there is a hard failure that will be shown in diagnostics. In that case you only need to click on the decrypt anyway button. Since Gpg4win-3.1.3 Kleopatra offers to decrypt such messages anyway if they were done using an old encryption algorithm. The reason for this was the public attention to attacks possible against messages without MDC with the publication of " EFail". Starting with Gpg4win-3.1.2 the MDC message integrity mechanism, which has been well established for over 15 years, is now enforced by GnuPG.
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