No good way to verify public image sha256 in docker hub – security concern

This is a little crazy but apparently we don’t have a good way to verify sha256 digests of public images in docker hub. Related thread is here: and also this stackoverflow is useful: . Problems in the nutshell: Publicly displayed digests on docker hub UI do not match those seen when pulling images […]

No-frills secret sharing with openssl

Motivation Sometimes we need to share a secret with a colleague, and frequently it’s a hassle to do so securely. Worst options include people simply sending plain-text secrets over email or slack. Better, if this is some sort of encrypted email service like ProtonMail, but still it’s a fairly brittle way if we’re dealing with […]

YubiKey for SSH on Windows: Complete Walkthrough

Update: Watch my talk at OWASP Ottawa discussing SSH security (gives perspective to this walkthrough). At Reliza we are switching to using YubiKeys for our SSH authentication which is possible via PGP encryption. This guide is for Windows and using SSH via PuTTY. I found several nice references on the web (which are listed in […]