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Tom Tervoort

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titleconferencedate
Three New Attacks Against JSON Web TokensBlack Hat USA 20232023-08-05
Three concrete attacks against JWT implementations: sign-encrypt confusion lets an attacker swap a signed JWT for an encrypted one and force a validator to…
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Breaking Kerberos' RC4 Cipher and Spoofing Windows PACsBlack Hat Europe 20222022-12-05
Finds a pre-hash bug in Kerberos RC4-HMAC that lets MD5 collisions produce matching PAC signatures, then turns it into a working exploit: uses a chosen-prefix…
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