Num's Codes

andrewl.us Shmoocon 2010 Crypto Challenge Pack

2010-08-13T13:28:00.002+02:00

Shmoocon 2010 Crypto Challenge Pack
Author: andrewl.us
Protection: GF-arithmetics, RSA, Modular-arithmetics and equation system over GF(2)

The 4th one is really tricky and can be solved in atleast two ways. See andrewl.us explanations posted after solution was posted on crackmes.de: http://rcejunk.blogspot.com/2010/08/shmoocon-2010-crypto-pack-solved.html

Generally: a really good package of different level crackmes and variations!

You can download my solution here

KKR's VoLtAgE Keygenme

2010-04-29T22:19:00.001+02:00

VoLtAgE Keygenme
Author: KKR
Protection: ECDSA-72,MD5,SHA1

Nice crackme, takes some time to fix the modded MD5 thought.. my solution is here

Happytown CrackMe 39

2010-03-08T18:49:00.003+01:00

Crackme 39
Author: Happytown
Protection: DSA, Hash (custom?)

A very straight forward crackme using a bit odd bigint library, if anybody know the name of it please let me know. Fun crackme, my solution is here

WiteG Crackme 8

2010-02-08T19:23:00.002+01:00

Crackme 8
Author: WiteG
Protection: ElGamal signature, RSA, Modular equation, small "cipher"

Cool all-around crackme, many different parts to solve. Nice one, my solution is here

Keygenme Tre

2010-01-26T20:56:00.002+01:00

Keygenme Tre

Recent crackme by me, using some interesting crypto with a own written biglib. More info in the readme.

No solutions yet(except my own).

HMX0101's Cockroach

2010-01-13T16:46:00.001+01:00

Cockroach
Author: HMX0101
Language: C/C++
Protection: CRC, 56bit-Cipher

This is quite a basic crackme but quite funny to reverse the cipher. Solution is here

Andrewl.us SDDecoder Junior

2009-11-25T20:46:00.004+01:00

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

2009-11-18T03:49:00.005+01:00

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

2009-11-14T00:51:00.002+01:00

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

2009-10-21T23:11:00.001+02:00

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.