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CTCTF 2015: Just Keep Going

Problem

Points: 50

Description:

Just keep going…
persevere.txt
Rot13->b64->repeat, should be automated for good results.

Hint:

nope

Solution

The problem description tells us exactly how to reverse the contents of the file. This file contains the output of base64, which makes binary data safe to export as ASCII text, and rot13, which is just the Caesar cipher with n = 13. However, instead of automation, we just copied and pasted a long chain of commands and pipes and then adjusted it until we got the flag.

[!] cat persevere.txt | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d | rot13 | base64 -d

Flag: isnt_automation_great

Other Resources

  • None.