Email encryption refers to encryption, and often authentication, of email messages, to protect the content from being read by any but the intended recipients. Email encryption has been used by journalists and regular users to protect privacy.
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.
Setting up and Using Email Encryption
Email clients such as Mozilla thunderbird provide native support for S/MIME secure email (digital signing and message encryption using certificates). Other encryption options include PGP and GNU Privacy Guard (GnuPG). Free and commercial software and add-ons are available as well, such as Gpg4win or PGP Desktop Email that support the OpenPGP type of encryption.
While PGP can protect messages, it can also be hard to use in the correct way. Researchers at Carnegie Mellon University published a paper in 1999 showing that most people couldn’t figure out how to sign and encrypt messages using the current version of PGP. Eight years later, another group of Carnegie Mellon researchers published a follow-up paper saying that, although a newer version of PGP made it easy to decrypt messages, most people still struggled with encrypting and signing messages, finding and verifying other people’s public encryption keys, and sharing their own keys.
- 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
- Lee, Micah (July 2, 2013). "Encryption Works: How to Protect Your Privacy in the Age of NSA Surveillance". Freedom of the Press Foundation. Retrieved 1 May 2014.
- Eric Geier, PCWorld. "How to Encrypt Your Email." Apr 25, 2012. Retrieved May 28, 2014.
- Alan Henry, Lifehacker. "How to Encrypt Your Email and Keep Your Conversations Private." Aug 14, 2013. Retrieved May 28, 2014.
- Klint Finley, WIRED. "Google’s Revamped Gmail Could Take Encryption Mainstream." Apr 23, 2014. Retrieved June 04, 2014.
- In Security and Usability: Designing Secure Systems that People Can Use, eds. L. Cranor and G. Simson. O'Reilly, 2005, pp. 679-702. "Why Johnny Can’t Encrypt."
- 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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