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Posts Tagged ‘opportunistic TLS’

SMTP TLS: All About Secure Email Delivery over TLS

Monday, October 2nd, 2017

TLS stands for “Transport Layer Security” and is the successor of “SSL” (Secure Socket Layer). TLS is one of the standard ways that computers on the Internet transmit information over an encrypted channel. In general, when one computer connects to another computer and uses TLS, the following happens:

  1. Computer A connects to Computer B (no security)
  2. Computer B says “Hello” (no security)
  3. Computer A says “Lets talk securely over TLS” (no security)
  4. Computer A and B agree on how to do this (secure)
  5. The rest of the conversation is encrypted (secure)

In particular:

  • The meat of the conversation is encrypted
  • Computer A can verify the identity of Computer B (by examining its SSL certificate, which is required for this dialog)
  • The conversation cannot be eavesdropped upon (without Computer A knowing)
  • The conversation cannot be modified by a third party
  • Other information cannot be injected into the conversation by third parties.

TLS (and SSL) is used for many different reasons on the Internet and helps make the Internet a more secure place, when used. One of the popular uses of TLS is with SMTP for transmitting email messages between servers in a secure manner.  See also:

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The Case For Email Security

Tuesday, March 31st, 2015

We all know that regular email is insecure; however, it may surprise you to learn just how insecure it really is. For example, did you know that messages which you thought were deleted years ago may be sitting on servers half-way around the world? Or, that your messages can can sometimes be read and modified in transit, even before they reach their destination? Did you know that forging email is very, very easy?  Can you trust what you read in an email?  Email security was never designed in to the internet from the beginning and as a result, many different solutions have evolved to plug the multitude of resulting issues.

This article is designed to teach you about how email really works, what the real email security issues are, what mitigations to these are generally in use, and what else you can to to protect you email.

Case for Email Security

Information security and integrity are centrally important  as we use email for personal and business communication: sending confidential and sensitive information over this medium every day. While you are reading this article, imagine how these security problems could affect your business, your personal life, and your identity…. if they have not already.

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Secure TLS Email for Bank of America Partners

Wednesday, August 28th, 2013

Bank Of America LogoSeveral years back, we discussed Enforcing Email Security with TLS when Communicating with Banks. This is a critical stipulation for many banks that have strict requirements that all email messages be encrypted in transit via TLS when communicating with them.

Bank of America

Bank of America (BoA) is a case in point.  Their requirements are as follows:

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