Profiling Whonix

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction This week I read a story announcing that the latest edition of Whonix had been released. I had heard of Whonix, but had never tried it. I knew it was a Linux distribution that tried to make it as easy and safe as possible to anonymize online […]

Investigating the Effects of TLS 1.3 on Corelight Logs, Part 1

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction I’ve written previously about Corelight data and encryption. I wanted to know how TLS 1.3 would appear in Corelight data, and compare the same network conversation over clear-text HTTP, TLS 1.2, and TLS 1.3. In this first of three parts, I will introduce TLS and demonstrate a […]

How Zeek can provide insights despite encrypted communications

By Anthony Kasza, Security Researcher, Corelight Labs Overview Encrypted communications are ubiquitous. While encryption provides confidentiality, it cannot prevent all means of traffic analysis. Certain protocols, such as SSH and TLS, ensure contents are not directly readable by monitoring systems. However, analysis of size and order of transmitted data can provide grounds for inference. This […]

Network security monitoring is dead, and encryption killed it.

By Richard Bejtlich, Principal Security Strategist, Corelight This post is part of a multi-part series on encryption and network security monitoring. This post covers a brief history of encryption on the web and investigates the security analysis challenges that have developed as a result. I’ve been hearing this message since the late-2000s, and wrote a […]