Oct
30

Hack.lu 2010 CTF Challenge #7 Writeup

Breiers Deathmatch (150) Schnuce Breier has challenged you to a cryptographer’s deathmatch. Connect to pirates.fluxfingers.net 8007/tcp and get the secret number. $ nc pirates.fluxfingers.net 8007 Hi. This is your friendly ‘Decryption Oracle’ We have implemented a well-known public-key cryptosystem. Guess which ;) Modulo: 5628290459057877291809182450381238927697314822133923421169378 062922140081498734424133112032854812341 Generator: 99 Public Key: 135744434201778324839308712462911647727754874814096844915 5264250239122362719894347099351280643528244 Ciphertext: (44750535504622985677351849167148532593337860047243938284 03819968944371696234280482660523326406427034, 40867215175893797288404… Continue reading »