Help! My IOT device has gone sentient!
All I wanted to know was the meaning of 42!
It's also waving its arms up and down, and I...
oh no! It's free!
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Automated Challenge Instructions Detected failure in challenge upload. Original author terminated. Please see attached file BeepBoop for your flag... human.
Author: N/A
Tags: crypto
The file delivered contained a sequence of beep and boop.
beep beep beep beep boop beep boop beep beep boop boop beep beep boop boop beep beep boop boop beep boop beep beep beep beep boop boop beep beep beep beep boop beep boop boop boop boop beep boop boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep beep boop beep boop boop beep boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep beep boop beep boop boop beep boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop boop boop boop beep boop
Now this looks like some binary code. If we replace beep with 0 and boop with 1 we get
0000101001100110011010000110000101111011011100100110101101100111011100100110010101111010011101100110000101101110011001110111001000101101011100100110101101100111011100100110010101111010011101100110000101101110011001110111001000101101011100100110101101100111011100100110010101111010011101100110000101101110011001110111001001111101
bits = "0000101001100110011010000110000101111011011100100110101101100111011100100110010101111010011101100110000101101110011001110111001000101101011100100110101101100111011100100110010101111010011101100110000101101110011001110111001000101101011100100110101101100111011100100110010101111010011101100110000101101110011001110111001001111101"
text = int(bits, 2)
text.to_bytes((text.bit_length()+7)//8, 'big').decode()This gives us fha{rkgrezvangr-rkgrezvangr-rkgrezvangr} which looks like some substitution cipher (rot13 for instance). And indeed, rot13 gives us the flag.
$ echo "fha{rkgrezvangr-rkgrezvangr-rkgrezvangr}" | rot13
sun{exterminate-exterminate-exterminate}Flag sun{exterminate-exterminate-exterminate}