arget13

# Quick implementation of ITU's recommendation P.676 (current v13, 8/2022)
# Please note: I'm not a python programmer (I prefer C/asm), so there probably
# are ways to minimize the loss of precission that I don't know of

import numpy as np

def _gaspl(d, f, T, p, den):
	d = d / 1000   # km
	f = f / 1e9    # GHz
	T = 273.15 + T # K

arget13

#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>

int main(int _, char** argv)
{
	FILE* f;
	munmap((void*) ((long)argv[0] & ~0xfff), 1);

	if(f = fopen("flag", "rb"))

arget13

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <sys/ioctl.h>
#include <string.h>

arget13

/* Compile with -znow */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <elf.h>

arget13

#!/usr/bin/env python3
from os   import *
from mmap import PROT_EXEC, PROT_READ
from sys  import argv

key = 0xa3

ELF_READ  = 4
ELF_WRITE = 2
ELF_EXEC  = 1

arget13

PlaidCTF 2020 : reee

Reversing (150 pts)

Story

Tired from all of the craziness in the Inner Sanctum, you decide to venture out to the beach to relax. You doze off in the sand only to be awoken by the loud “reee” of an osprey. A shell falls out of its talons and lands right where your head was a moment ago. No rest for the weary, huh? It looks a little funny, so you pick it up and realize that it’s backwards. I guess you’ll have to reverse it.

Problem details

Hint: The flag format is pctf{$FLAG}. This constraint should resolve any ambiguities in solutions.

arget13

from pwn import *

# CONFIG #

## Basic stuff
rhost = "localhost" # Remote host
rport = 1234        # Remote port
fname = "a.bin"     # Output filename

## Address where the binary is loaded

arget13

/**
    Name        : Asteroids
    Author      : Arget
    Version     : 1.4
    Date        : 16/11/2017
    Description : A simple implementation of asteroids game for modern terminals.
    Notes       : Compile with `gcc -o asteroids asteroids.c'
*/

#include <stdio.h>    /* printf(), putchar() */