FindAndOpen PicoCTF 2023

FindAndOpen

200 points

AUTHOR: MUBARAK MIKAIL

Description
Someone might have hidden the password in the trace file.
Find the key to unlock [this file]. This [tracefile] might be good to analyze.

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This was a kinda random challenge, using strings on the .pcap file I got a lot of random stuff but in between it there were a could of messages of interest:

Flying on Ethernet secret: Is this the flag
iBwaWNvQ1RGe1Could the flag have been splitted?
AABBHHPJGTFRLKVGhpcyBpcyB0aGUgc2VjcmV0OiBwaWNvQ1RGe1IzNERJTkdfTE9LZF8=
PBwaWUvQ1RGesabababkjaASKBKSBACVVAVSDDSSSSDSKJBJS
PBwaWUvQ1RGe1Maybe try checking the other file

Well basically I thought that the string:

AABBHHPJGTFRLKVGhpcyBpcyB0aGUgc2VjcmV0OiBwaWNvQ1RGe1IzNERJTkdfTE9LZF8=

was a base64 string but decoding it seperatly got nothing, and well if the file said: "Could the flag have been splitted?" I tried arranging:

iBwaWNvQ1RGe1, AABBHHPJGTFRLKVGhpcyBpcyB0aGUgc2VjcmV0OiBwaWNvQ1RGe1IzNERJTkdfTE9LZF8= and PBwaWUvQ1RGesabababkjaASKBKSBACVVAVSDDSSSSDSKJBJS

One after another to get something.

When I decoded the string: iBwaWNvQ1RGe1PBwaWUvQ1RGe1AABBHHPJGTFRLKVGhpcyBpcyB0aGUgc2VjcmV0OiBwaWNvQ1RGe1IzNERJTkdfTE9LZF8= in cyberchef I got the output:

...(garbage)This is the secret: picoCTF{R34DING_LOKd_

Well using it as the password to unlock the zip revealed a file which had the flag:

picoCTF{your flag}