1_wanna_b3_a_r0ck5tar

• Description: I wrote you another song. Put the flag in the picoCTF flag format
• Difficulty: Medium

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🔎 Solution

This challenge revolves around Rockstar - an esoteric programming language (esolang) designed to make code look like the lyrics of a rock song.

Given the lyrics, we used the rockstar-py tool to transpile them into Python.

rockstar-py -i lyrics.txt -o script.py

Once rewritten, the resulting Python code looked like this:

Rocknroll = True
Silence = False
a_guitar = 10
Tommy = 44
Music = 170

the_music = int(input("Enter the guitar number: "))

if the_music == a_guitar:
    print("Keep on rocking!")
    the_rhythm = int(input("Enter the rhythm number: "))
    if the_rhythm - Music == 0:
        Tommy = 66
        print("Tommy:", Tommy)
        Music = 79
        Jamming = 78
        print("Music:", Music)
        print("Jamming:", Jamming)
        Tommy = 74
        print("Tommy:", Tommy)
        print("They are dazzling audiences!")
        Rock = 86
        print("Rock:", Rock)
        Tommy = 73
        print("Tommy:", Tommy)
        print("Bring on the rock!")
    else:
        print("That ain't it, Chief.")
else:
    print("That ain't it, Chief.")

Running the program, we entered the guitar number (a_guitar) and the rhythm value so that the_rhythm - Music = 0 (with Music = 170, the rhythm input should be 170).

> python script.py       
Enter the guitar number: 10
Keep on rocking!
Enter the rhythm number: 170
Tommy: 66
Music: 79
Jamming: 78
Tommy: 74
They are dazzling audiences!
Rock: 86
Tommy: 73
Bring on the rock!

The program output the sequence of values: 66, 79, 78, 74, 86, 73. These are ASCII codes, which, when converted to characters using an ASCII table, spell BONJOVI - and that string serves as the flag.

🚩Flag

picoCTF{BONJOVI}