A list of references compiled for the comprehensive comparison between PGP and S/MIME.
[1] {https://www.youtube.com/watch?v=cvJ0jY6xbMI&ab_channel=TheSecurityBuddy} S/MIME vs. PGP - What is the difference?
[2] {https://www.pointsharp.com/en/hub/smime-vs-pgp} {S/MIME vs. PGP}
[3] {https://www.usenix.org/conference/usenixsecurity18/presentation/poddebniak} {Efail: Breaking S/MIME and OpenPGP Email Encryption using Exfiltration Channels}
[4] {https://www.thesecuritybuddy.com/pgp-and-gpg/smime-vs-pgp/} {S/MIME vs PGP by Securitybuddy}
[5] {https://ucf-flvc.primo.exlibrisgroup.com/discovery/fulldisplay?docid=alma990228041820306596&context=L&vid=01FALSC_UCF:UCF&lang=en&search_scope=All_Available&adaptor=Local%20Search%20Engine&tab=AvailableNow&query=any,contains,31791645&sortby=rank} {Garfinkel, Simson. PGP: Pretty Good Privacy. 1st ed. Sebastopol, CA: O’Reilly & Associates,1995.Print.}
[6] {https://pmc.ncbi.nlm.nih.gov/articles/PMC8318545/?utm_source=chatgpt.com} {Reuter A, Abdelmaksoud A, Boudaoud K, Winckler M. Usability of End-to-End Encryption in E-Mail Communication. Front Big Data. 2021;4:568284. Published 2021 Jul 14. doi:10.3389/fdata.2021.568284}
[7] {https://homes.luddy.indiana.edu/kapadia/papers/kapadia_casestudy.pdf?utm_source=chatgpt.com} {Kapadia A. “A Case (Study) For Usability in Secure Email Communication” — Focuses on S/MIME (and PGP) usability from a case study perspective.}
[8] {https://www.cs.usask.ca/documents/technical-reports/2011/TR-2011-03.pdf?utm_source=chatgpt.com} {Zibran M.F. “Cryptographic Security for Emails: A Focus on S/MIME” — A detailed review of S/MIME architecture with usability and adoption commentary.}
[9] {https://dl.acm.org/doi/abs/10.17487/RFC2046} {N. Freed and N. Borenstein. 1996. RFC2046: Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types. RFC Editor, USA.}
[10] {https://dl.acm.org/doi/abs/10.17487/RFC1521} {N. Borenstein and N. Freed. 1993. RFC1521: MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies. RFC Editor, USA.}
[11] {https://levelblue.com/blogs/security-essentials/explain-pgp-encryption-an-operational-introduction} {PGP Encryption Software: What is it and How Does it Work? (Fig.1)}
[12] {https://www.cisco.com/c/en/us/td/docs/security/esa/esa15-0/user_guide/b_ESA_Admin_Guide_15-0/b_ESA_Admin_Guide_12_1_chapter_010100.html} {S/MIME Security Services in Email Gateway (Fig.2)}
[13] {https://dx.doi.org/10.2139/ssrn.5358848} {A Comparative Evaluation of Secure Email Protocols: PGP vs. S/MIME}
[14] {https://www.researchgate.net/publication/328042380_Efail_Breaking_SMIME_and_OpenPGP_Email_Encryption_using_Exfiltration_Channels_Efail_Breaking_SMIME_and_OpenPGP_Email_Encryption_using_Exfiltration_Channels} {Efail: Breaking S/MIME and OpenPGP Email Encryption using Exfiltration Channels Efail: Breaking S/MIME and OpenPGP Email Encryption using Exfiltration Channels}
[15] {https://www.researchgate.net/publication/341541437_Johnny_you_are_fired_-Spoofing_OpenPGP_and_SMIME_Signatures_in_Emails_Johnny_you_are_fired_-Spoofing_OpenPGP_and_SMIME_Signatures_in_Emails} {"Johnny, you are fired!" -Spoofing OpenPGP and S/MIME Signatures in Emails "Johnny, you are fired!" -Spoofing OpenPGP and S/MIME Signatures in Emails}
[16] {https://www.wisestamp.com/blog/smime/} {S/MIME encryption: who needs it & how to get it}
[17] {https://snapshot.internetx.com/en/blogpost/s-mime-vs-openpgp-whats-the-difference/} {S/MIME vs. OpenPGP | What’s the difference?}