Cryptographic Hash Functions

Posted on Sa 18 August 2018 in Security, Cryptography, Hash Functions • Tagged with Math, Integrity, Hash-Functions, Merkle-Damgård

Introduction

This blog post will introduce cryptographic hash functions. We are going to discuss the Merkle-Damgård construction which underlies many hash functions that were and are used nowadays. The MD4, MD5, SHA-1 and SHA-2 hash families are all functions that built on top of the Merkle-Damgård construction. Then we will introduce an alternative construction that was popularized during the publication of Keccak (SHA-3): The Sponge construction.

But what are cryptographic hash functions good for?

The general idea is to apply a unique and stable fingerprint to each input data \(x …


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How to find large prime numbers for RSA with the Miller-Rabin Primality Test

Posted on So 12 August 2018 in Security, Cryptography • Tagged with Python, Primes, Math, RSA, asymmetric key cryptography, Miller-Rabin Primality Test, Fermat

Introduction

All sources for this blog post can be found in the Github repository about large primes. The most recent version of the sources may only be found in the Github repository.

It has been a long time since I found the energy to write a new blog post. In this article, I am going to dig into a interesting area of cryptography: The task to find large prime numbers. We hopefully are all familiar with the concept of prime numbers. Prime numbers are integers \(p\) which are dividable only …


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Privilege Escalation Techniques

Posted on Mi 10 August 2016 in Security • Tagged with Linux, Privilege Escalation, root

This blog post will serve as a cheatsheet to help in my future pentesting experiments and wargames when I am stuck and don't know how to proceed. I hope it will be of use for some people out there. This document will likely change and evolve in future revisions.

In this blog post I will discuss common privilege escalation techniques. I assume that an attack got a foothold into the server by spawning a webshell over SQL-Injections or similar web exploitation vectors.

Helpful resources

Other people have published great information …


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Probabilistic data structures to estimate cardinalities and frequencies of massive streams

Posted on Mi 20 Juli 2016 in BigData • Tagged with LogLog-Count, Count-Min-Sketch, Linear Count, Big Data, Stream Processing

In the following blog post we will introduce three different Big Data algorithms. More specifically, we will learn about probabilistic data structures that allow us to estimate cardinalities and frequencies of elements that originate from a massive stream of data. This blog post is heavily inspired by a the well written article on probabilistic data structures for web analytics and data mining. I will not cover the mathematics behind those data structures, the beforementioned blog post does that much better. And if not, then you should probably consult the original …


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What other package managers are vulnerable to typo squatting attacks?

Posted on Do 30 Juni 2016 in Security • Tagged with security, Typosquatting, nuget, cargo

In my last blog post about typosquatting package managers I discussed my findings about attacking the programming language package managers from rubygems.org, PyPi and npmjs.com.

This blog contribution generated quite some interest and people subsequently asked themselves whether other package managers might also be vulnerable to this hybrid attack (typosquatting involves a technical and psychological attack vector). During the time I wrote my thesis, I encountered some other package managers. A very good overview of some of the most recent package managers gives the github showcase page about …


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Typosquatting programming language package managers

Posted on Mi 08 Juni 2016 in Security • Tagged with PyPi, Npmjs.com, rubygems.org, security, Typosquatting

Edit: It seems that the blog post and the thesis caused quite some interest. Please contact me under the following mail address, since my mail server on this VPS is constantly down :/ tschachn [|[at]|] hu-berlin [[|dot|]] de

In this blog post I will show how to use the neat JavaScript library chart.js with the well-known Python web-framework Django. As a sample data set I will make use of my workout progress data between May 2016 and August 2016.

  • 17000 computers were forced to execute arbitrary code by typosquatting programming …

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