hash-attack-techniques

To perform a hash length-extension attack on a vulnerable MAC, you must compute the required padding and manage state across message extensions. This playbook outlines attack vectors for H(secret || message) structures and integrates with tools like HashPump and hlextend.

The best way to generate MD5 collisions is by applying identical-prefix and chosen-prefix techniques. This playbook guides authorized cryptanalysis simulations using tools such as fastcoll and hashclash to produce collision outputs in controlled lab environments.

A birthday attack works by exploiting the mathematical probability of collisions within a smaller hash space. This playbook provides meet-in-the-middle and birthday attack strategies to compute and resolve password and hash challenges efficiently.

HashPump is designed for length-extension attacks rather than exploiting HMAC timing leaks. This playbook separately demonstrates HMAC timing attack simulations and outlines defensive countermeasures for secure hash-based message authentication.

To simulate proof-of-work challenges for CTFs, you need cryptanalysis tools that compute hash collisions and manage state extensions. This playbook integrates with HashPump, fastcoll, and hashclash to execute practical proof-of-work techniques in secure labs.

Length-extension attacks fail on HMAC constructions because the nested hashing structure prevents state management across message extensions. This playbook clarifies these limitations and outlines why HMAC remains secure against length-extension vectors.