CSAW 2017 Write up
1. Misc 50 2. Forensic 150 3. Forensic 200 4. Crypto 350 5. Misc 100 ( twich ) 1. nc misc.chal.csaw.io 4239 flag{@n_int3rface_betw33n_data_term1nal_3quipment_and_d@t@_circuit-term1nating_3quipment} In this challenge, when we connect to the server, it will give us 11 bits bin Okay, It is 8-1-1 even parity . It will look like 0 0.....0 0 0 start data parity bit stop So now we check the data and the parity bit , if it right, we will get the data[-1] and send '1', or if it wrong, we will send '0' to make it retranmiss With parity bit, we can count the amount of bit '1' in data , if the amount is even, the parity bit will be 0 okay now we write a script to do it and eat some snack, then we got the flag 2. Forensic 150: It's registration day! These forms just seem longer and longer... UPDATE 10:44 Eastern: New pcap that should be a bit easier to work with. UPDATE 2:58 East