I dunno what bytecode is. Could you tell me what input of 'checkNum' will return true? The flag is just a 32-bit signed integer as a decimal (nothing else.) https://mega.nz/#!qfATFaKR!zaTNExq3Bm1MjJnePjTGQyvnvLX_xZxhbGaMv_ypaxo
3 days ago
this is a useful link https://en.wikipedia.org/wiki/List_of_Java_bytecode_instructions
2 months ago
Had problems with the program that should have calcualted the flag, then switched from Python to C and everything was ok lmao
Feel sorry for those who solve with bruteforcing, I am sure that was not the idea, and understanding how to reverse the equation is fun
7 months ago
10 months ago
11 months ago
Very cool. Had to spend a lot of time to understand the java code. Gave up and came back at least twice.
1 year ago
Now I know bytecode as well as assembly
work out literally
2 years ago
got no idea!
Chalenge solved using google. But i really cant find a tool what can parse that code back to java code.