For the first challenge, we are given a game written in Python. Luckily the source code is also given, so let's dig into the source code directly.
The source code is not that long, and quickly we noticed the GenerateFlagText function. If we read this line closely:
return ''.join([chr(ord(c) ^ key) for c in encoded])
| import itertools | |
| from collections import defaultdict | |
| target_byte_size = 4 | |
| target_size = 1 << (target_byte_size * 8) | |
| usable_bytes = (0x05, 0x50, 0xc3) | |
| reverse_mapping = defaultdict(list) | |
| package main | |
| import ( | |
| "crypto/tls" | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "net" | |
| "net/http" | |
| "sync" |
| #include <iostream> | |
| #include <fstream> | |
| #include <vector> | |
| #include <unordered_map> | |
| #include <forward_list> | |
| #include <z3++.h> | |
| int width, height; | |
| std::vector<bool> walls; |
| package main | |
| import ( | |
| "fmt" | |
| ) | |
| var mem = map[string]uint8{} | |
| var str string | |
| func MEMORY(address uint8) byte { |
| package main | |
| import ( | |
| "log" | |
| "os" | |
| "math" | |
| "github.com/youpy/go-wav" | |
| ) |
| package main | |
| import ( | |
| "fmt" | |
| "math" | |
| "math/rand" | |
| "reflect" | |
| "time" | |
| ) |