Andrewl.us SDDecoder Junior

SDDecoder Junior
Author: andrewl.us
Language: C/C++
Protection: GF(2) Equations

Very interesting one, linear system of equations over GF(2), solved using Gauss Elimination over GF(2). Plus some other GF(2) arithmetics are in the challenge. The crackme is a part of a quest to learn more about MQ schemes and eventually break SDDecoder. My solution to the SDDecoder Junior is here

Mucki's Protector II

Mucki's Protector II
Author: Mucki
Language: Assembler
Protection: RSA,Custom Packer,Small VM

This one uses a custom packer and a small RSA(32bit). Read my solution here. It has a small unpacker for the packer also.

Pineware_002 - Keygenme

Pineware_002 - Keygenme
Author: Ultimate Pinecone's
Language: Assembler
Protection: Obfusticated VM, Befunge language.

The crackme is actually a Befunge intepreter, with some additional commands. Algorithm itself is very trivial calculations.

Read my solution here.

First

I recently started this blog, here is some old work that I thought should be viewed here, work from crackmes.de

Crackmes

Keygenme Två(Tvaa) crackme, recent crackme, some equations, custom blockcipher over GF(2^19).
Solutions: andrewl.us, Encrypto, HMX0101

Seafun Lamagle Keygenme crackme, this crackme I wrote sometime ago. Its about a exploit in the ElGamal scheme.
Solutions: HMX0101

Solutions

dmoon's keygenme 2, solution crackme about GCD algorithm etc.

Encrypto's Aurora, solution colloborated solution, includs some cryptography, reversing a custom cipher etc.

HMX0101's Spare Time, solution .net crackme with a obfusticated XTEA cipher.

freesoul's OwnMe... , solution maths.

Happytown's CrackMe.happytown.VC.0029, solution modular arithmetic.

Cyclops CLR SerialMe 0x01, solution also a cool crackme, plain math, written in .NET, its about a water jug problem.

Cyclops SCORPiON, solution this one is interesting, a modified ICE blockcipher and I a digital signature scheme(Zheng's Signencrypt).

c00lw0lf's CHAOS KeygenMe 8.3: solution quite normal, crackme with RSA314 and two hashes TIGER192 and HAVAL.

Andrewl.us's UPSKiRT, solution about modular arithmetic.

HMX0101's Bored: solution about the Paillier Cryptosystem.