CTF: 3DSCTF 2016
In this CTF challenge, a file 'base32000.zip' is provided. Once decompressed,
we get a large text file with no line terminators:
Using 'base64' we try to decode the file and see that we get a smaller file. Following
with some manual iterations we get smaller and smaller files, so in the end we automate
the process using an ad-hoc shell script 'base64_recursive_decoder.sh'.
Testing for 100 iterations we conclude that the flag was recursively encoded in base64, 50 times: