Graymail H265 [top] Official

: Graymail, H.265, HEVC, email filtering, SEI, evasion, video steganography. References (abridged) [1] Asghar, M. R., et al. “PDF smuggling revisited.” ACSAC 2021 . [2] Sullivan, G. J., et al. “HEVC: Overview of the High Efficiency Video Coding standard.” IEEE TCSVT 2012 . [3] Proofpoint. “2024 Email Security Threat Report” (internal). [4] Libde265: open source HEVC implementation. [5] SpamAssassin rule set 4.0.0 – video/text detection. Appendix A: GrayMail265 pseudocode (available in extended arXiv version).

: Graymail, H.265, HEVC, email filtering, SEI, evasion, video steganography. References (abridged) [1] Asghar, M. R., et al. “PDF smuggling revisited.” ACSAC 2021 . [2] Sullivan, G. J., et al. “HEVC: Overview of the High Efficiency Video Coding standard.” IEEE TCSVT 2012 . [3] Proofpoint. “2024 Email Security Threat Report” (internal). [4] Libde265: open source HEVC implementation. [5] SpamAssassin rule set 4.0.0 – video/text detection. Appendix A: GrayMail265 pseudocode (available in extended arXiv version).