AngstromCTF_2018: Back To Base - ICS

Category: Crypto Points: 20 Description:

Here at ångstromCTF, we know all the powers of two! Try and decode this.

Write-up

We get a file containing,

Part 1: 011000010110001101110100011001100111101100110000011011100110010101011111011101000111011100110000010111110110011000110000
Part 2: 165 162 137 145 151 147 150 164 137 163 151 170 164 63 63 
Part 3: 6e5f7468317274797477305f733178
Part 4: dHlmMHVyX25vX20wcmV9

Flag is the concatenation of the four decoded parts.

Using any converter, particularly rax2, we get the following,

root@ctf:~# rax2 -b 011000010110001101110100011001100111101100110000011011100110010101011111011101000111011100110000010111110110011000110000
actf{0ne_tw0_f0

root@ctf:~# rax2 165o 162o 137o 145o 151o 147o 150o 164o 137o 163o 151o 170o 164o 63o 63o | rax2 -s
ur_eight_sixt33

root@ctf:~# rax2 -s 6e5f7468317274797477305f733178
n_th1rtytw0_s1x

root@ctf:~# rax2 -D dHlmMHVyX25vX20wcmV9
tyf0ur_no_m0re}

Therefore, the flag is actf{0ne_tw0_f0ur_eight_sixt33n_th1rtytw0_s1xtyf0ur_no_m0re}.

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