Email encryption can rely on public-key cryptography, in which users can each publish a public key that others can use to encrypt messages to them, while keeping secret a private key they can use to decrypt such messages or to digitally encrypt and sign messages they send.
Protocols for email encryption include:
Mail sessions encryption
The STARTTLS SMTP extension is a TLS (SSL) layer on top of the SMTP connection. While it protects traffic from being sniffed during transmission, it is technically not encryption of emails because the content of messages is revealed to, and can therefore be altered by, intermediate email relays. In other words, the encryption takes place between individual SMTP relays, not between the sender and the recipient. When both relays support STARTTLS, it may be used regardless of whether the email's contents are encrypted using another protocol.
The Signed and Encrypted Email Over The Internet demonstration has shown that organizations can collaborate effectively using secure email. Previous barriers to adoption were overcome, including the use of a PKI bridge to provide a scalable public key infrastructure (PKI) and the use of network security guards checking encrypted content passing in and out of corporate network boundaries to avoid encryption being used to hide malware introduction and information leakage.
- DataMotion, Inc.
- Email authentication
- Email privacy
- Enigmail - Thunderbird plug-in
- Galaxkey - iOS, Android, Windows,BlackBerry and outlook plug-in
- GPGMail - OS X Mail.app plug-in
- HTTP Secure - a widely used communications protocol for secure communication over a computer network
- Secure Messaging
- Dark Mail Alliance
- Gaw, Shirley; Felten, Edward W.; Fernandez-Kelly, Patricia. "Secrecy, Flagging, and Paranoia: Adoption Criteria in Encrypted E-Mail | CHI 2006 (Proceedings of ACM SigChi)" (PDF). Cs.princeton.edu.
- Kindervag, Stephanie; Balaouras; McKee, Jessica (January 30, 2012). "Killing Data (this report costs 499 dollars)". Forrester.com.
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