Meaning of Life

Senpai, what is the meaning of life ?

We are given a web where we can input some number in the form and there is a encoded base64 string. And if we decode the encoded msg we will be given a link to Rick Astley song.

Using burpsuite I iterated over 1 to 100 giving inputs to the form. At input 42 it gave a different base64. `

aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1GSVViUkprS2psRQ==

If we decode it we will get an youtube link. Passing the audio to morse code decoder here. We can get the inner part of the flag CIC4D4FLI35 we wrap it flag{}

flag{CIC4D4FLI35}