"Johnny, you are fired!" -- Spoofing OpenPGP and S/MIME Signatures in Emails
J. Müller, M. Brinkmann, D. Poddebniak, H. Böck, S. Schinzel, J. Somorovsky, J. Schwenk, in: 28th USENIX Security Symposium (USENIX Security 19), USENIX Association, Santa Clara, CA, 2019, pp. 1011–1028.