GPG : "No secret key found" error

[Robert J. Hansen]

> I am trying to write in plain text mode so hopefully you won't be
> seeing it in HTML.

Success!  Thank you.

> Can you please suggest to me the steps that I should follow to
> redesign my solution, considering the password security?

I already have, twice.

For the third time: remove the passphrase from your private key, and 
make sure the location where you're storing your private key is safe.