base646464
Description
Encoding something multiple times makes it exponentially more secure!
Files
Lets take a look at generate.js, which reads
const btoa = str => Buffer.from(str).toString('base64');
const fs = require("fs");
const flag = fs.readFileSync("flag.txt", "utf8").trim();
let ret = flag;
for(let i = 0; i < 25; i++) ret = btoa(ret);
fs.writeFileSync("cipher.txt", ret);
The function btoa is basically string to its base64 encoding.
The flag is encoded repetitively 25 times in a for loop.
We just need to base64 decode it 25 times and we will get the flag.
from base64 import b64decode
with open('cipher.txt','r') as cipher_file:
data = cipher_file.read()
for i in range(25):
data = b64decode(data)
print(data)
A cool sarcasm on bad crypto challenges in CTFs :)
flag{l00ks_l1ke_a_l0t_of_64s}
PREVIOUSCTFs-2020