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We have a CPU mystery! We found a way to cause some processors to enter a glitch state where the normal rules don’t apply, but what does that mean…? If you’re interested what can go wrong inside modern CPUs, read on! Introduction If you’ve ever written any x86 assembly at all, you’ve probably used rep movsb. It’s the idiomatic way of moving memory around on x86. You set the source, destination, di

If you remove the first word from the string "hello world", what should the result be? This is the story of how we discovered that the answer could be your root password! Introduction All x86-64 CPUs have a set of 128-bit vector registers called the XMM registers. You can never have enough bits, so recent CPUs have extended the width of those registers up to 256-bit and even 512-bits. The 256-bit

Introduction I’ve spent a lot of time trying to understand the attack surface of popular password managers. I think I’ve spent more time analyzing them than practically anybody else, and I think that qualifies me to have an opinion! First, let’s get a few things out of the way. For some reason, few subjects can get heated faster than passwords. Maybe politics and religion, but that’s about it. It’