Secure/Multipurpose Internet Mail Extensions, or short S-MIME, is a standard for public key encryption and signing of MIME data.

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What is “web of trust” in PGP and S-MIME? [migrated]

I'm studying network and system security and I came across the phrase Web of Trust: In cryptography, a web of trust is a concept used in PGP, GnuPG, and other OpenPGP-compatible systems to ...
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Security of S/MIME in case of CA compromise

Suppose Alice and Bob are exchanging messages using S/MIME, protected by certificates that have been issued by either the same CA or by two mutually independent CAs. There exists an adversary Mallory ...
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Can S/MIME be still considered secure?

Previoulsy I had asked this question at http://stackoverflow.com/questions/18235983/can-s-mime-be-still-considered-secure but I feel this forum is topic-wise the right place. Recently there has been ...