Ask the Experts

Email and messaging threats

Comparing Diffie-Hellman vs. RSA key exchange algorithms

See which encryption method uses digital signatures, symmetric key exchanges, bulk encryption and much more in this Diffie-Hellman vs. RSA showdown. Continue Reading
What's the purpose of CAPTCHA technology and how does it work?

Learn about the purpose of CAPTCHA challenges that enable websites to differentiate bots from authentic users to stop spammers from hijacking forums and blog comment sections. Continue Reading
What are the most important email security protocols?

Internet email was designed independent of security considerations, but these are the top email security protocols that add mechanisms to keep messaging safe from threats. Continue Reading
What is MTA-STS and how will it improve email security?

Discover how the MTA-STS specification will improve email security by encrypting messages and enabling secure, authenticated email transfers between SMTP servers. Continue Reading
What are the top enterprise email security best practices?

Enterprises have many options for email security best practices, ranging from deploying email security protocols to educating end users on the dangers of phishing. Continue Reading

Can PDF digital signatures be trusted?

Digital signatures on PDF documents don't necessarily guarantee their contents are valid, as new research shows viewer implementations don't always detect incomplete signatures. Continue Reading
How were attackers able to bypass 2FA in a Reddit breach?

Reddit announced a breach after users were socially engineered and attackers bypassed 2FA protocols. Discover how this attack was possible and how sites can avoid falling victim. Continue Reading
What is behind the growing trend of BEC attacks?

BEC attacks cost over $676 million in 2017, according to the FBI's Internet Crime Report. Learn how to recognize possible BEC attacks from expert Michael Cobb. Continue Reading
How can U2F authentication end phishing attacks?

By requiring employees to use U2F authentication and physical security keys, Google eliminated phishing attacks. Learn how the combination works from expert Michael Cobb. Continue Reading
What are DMARC records and can they improve email security?

Last year, the U.S. federal government mandated that by October 2018, all agencies must have DMARC policies in place. Learn how complicated this requirement is with Judith Myerson. Continue Reading
Zyklon malware: What Microsoft Office flaws does it exploit?

Zyklon malware targets three previously patched Microsoft Office vulnerabilities. Learn how attackers can access passwords and cryptocurrency wallet data with expert Judith Myerson. Continue Reading

How are tech support scams using phishing emails?

Threat actors are using phishing email campaigns to fool users with tech support scams and fake Blue Screens of Death. Learn how these campaigns work with expert Nick Lewis. Continue Reading
PGP keys: Can accidental exposures be mitigated?

The accidental publication of an Adobe private key could have put the company in jeopardy. Matt Pascucci explains how it happened and how to better protect PGP keys. Continue Reading
How is cross-platform malware carried in Word docs?

Cross-platform malware enables attackers to leverage their attacks using infected Microsoft Word docs. Expert Nick Lewis explains how the attacks work and how to defend against them. Continue Reading
Libpurple flaw: How does it affect connected IM clients?

The libpurple library contains a code execution vulnerability that affects the IM clients that were developed using it. Expert Michael Cobb explains how the flaw works. Continue Reading