I was able to decrypt it. You don't learn if you don't try 😉
I guess it wasn't that bad for the first time attempt. Thanks for the opportunity to seek new things. Now I feel more encouraged to learn about it more.
Time to learn something new, posting mine soon !
There we go. There is good news for mobile users (Android).
I have managed to write a tutorial for Android users, too. You may want to check it
[Android Tutorial] PGP Signature - Encrypt/Decrypt message. As always, it does not seem like people are interested in learning PGP things anymore unless it benefits them in any way. But if users comes to this thread and want to learn, I guess all type of users (mobile and PC) will be able to use this technology now.