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Attacking end-to-end email encryption

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Attacking end-to-end email encryption
Subtitle
Efail, other attacks and lessons learned.
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165
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CC Attribution 4.0 International:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Abstract
In this talk, I’ll present several attacks that leak the plaintext of OpenPGP or S/MIME encrypted emails to an attacker. Some of the attacks are technically interesting, i.e. the two different efail attacks, some are somewhat silly, yet effective. Some abuse HTML emails, some also work with plain ASCII emails. Furthermore, I’ll discuss our lessons learned and describe the efail-related changes to mail clients and the OpenPGP and S/MIME standards.
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