More Smoked Leet Chicken

Sep 21

hack.lu CTF 2011 Spy Aboard! (300)

By hellman in Writeups

Category: crypto

We have a spy aboard! For around 5 minutes ago we intercepted an encrypted transmission to an enemy outpost. It seems like we interrupted the mole in the act because we found an open transmission program on our terminals. We are 100% sure that he sent the position of our fleet to the outpost to plan an attack against us. Our position due the transmission was:

position: Harcon System , Planet Crematoria , x: 129.23432231423 degrees y: 111.13442353423 degrees , z: 100,13142234423 degrees

We need the spies autorization code to prevent this attack. You as our crypto expert you have to find it! The survival of 10000 brave men, women and children depends on you!!!
GOOD LUCK!

download

Summary: ElGamal Diffie-Hellman, bad protocol usage, known plaintext attack

2011, crypto, ctf, diffie-hellman, elgamal, hacklu, python
2 comments

Sep 21

hack.lu CTF 2011 Simplexor (200)

By hellman in Writeups

Category: crypto

To get a better security we deceided to encrypt our most secret document with the secure xor-algorithm. Unfortunately we lost the key. Now we are sad. Can you help us recovering the key?

Download

Summary: recovering multibyte xor-key, using autocorrelation

200, 2011, base64, crypto, CrypTool, ctf, hack.lu, phrack, xor, xortool
4 comments

Sep 21

hack.lu CTF 2011 Antique Space Shuttle (300)

By hellman in Writeups

Category: exploiting

Your command is to get as much information about the crew of an antique space shuttle. We know our acient father used finger as reference point at

nc ctf.hack.lu 2003

Summary: bash injection, and buffer overflow on a suid binary to get more privilegies

2011, 300, binary, buffer overflow, ctf, exploit, finger, hack.lu, nc, netcat, python, shell injection, sparc, symlink, system
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Sep 21

hack.lu CTF 2011 Space Station 0xB321054A (300)

By hellman in Writeups

Category: exploiting

You have seen a deserted space station. Your task is to enter it. The first barrier is the access system. But you can find a module with the application on it. Here is the file:

download

What is the key?

(There is also station A, but station B is the advanced one.)

Summary: patching smali code for debug output

2011, 300, android, apk, apk manager, apktool, ctf, hack.lu, reverse, sdk, smali
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Sep 13

DEFCON 19 Final – hiver

By zyx2145 in Writeups

This challenge was on logic and understanding of the bloom filter. The binary is for FreeBSD.

binary

Summary: understanding of the bloom filter, bruteforce bloom filter set.

2011, ctf, defcon, defcon 19, final, hiver
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Sep 13

DEFCON 19 Final – forgetu

By zyx2145 in Writeups

This challenge was on remote exploiting. The binary is for FreeBSD.

binary

Summary: bruteforce password, buffer overflow, jump to shellcode

2011, ctf, defcon, defcon 19, final, forgetu
2 comments

Aug 12

Team IV took 4th place in the DEFCON 19 CTF FINAL

By zyx2145 in Uncategorized

LeetMore in the Team IV took 4th place in the DEFCON 19 CTF FINAL!
Congratulations guys! This is definitely a great achievement!
Proof: http://ddtek.biz