ebCTF 2013 | cry100 « Classic » [Write Up]

« We found some crypto ciphers on our attic. Can you decipher all text and put together the flag? » In this first crypto challenge, we were given six classic ciphertexts to break. Each plaintext gave a part of the final flag ebCTF{md5}. I. Vigenere The first ciphertext was a simple vigenere : W yzrqc az […]

ebCTF 2013 | Cry200 « One to many » [Write Up]

« We identified some unground operatives that are using RSA to exchange messages with each other. We managed to incercept some, can you decrypt them? » In this crypto challenge, we were given 4096 text files containing n, the modulus, and encrypted_msg, the… encrypted message in RSA, for example: The modulus in each file were […]

UfoCTF 2013 | Web100 (A1 Galaxy) [Write Up]

Suite à l’UfoCTF s’étant déroulé ce week-end, nous avons résolu l’épreuve « A1 Galaxy FlagStore ». Il fallait exploiter des injections SQL pour au final arriver au dernier level (3) de sorte à récupérer le flag. « This challenge was intended to be a warm-up » … Tu parles! Vous allez comprendre pourquoi 🙂   Level I […]