I don't quite understand what you are trying to do. In the first code fragment you are doing something with gpg (don't know what it is, it depends on the --option) and in the second fragment you are reading the contents of a file.

Can you reword this?

• Where is your passphrase coming from? (your Perl script, a file, or is gpg supposed to prompt for it?)
• What is supposed to be in the file called file? (the stuff to be decrypted? the passphrase?)
• Where should the output go? (standard output? your Perl script should collect it?

That said, you might be interested in gpg's --passphrase-fd option. It allows you to supply the passphrase to gpg over a pipe, and without disturbing any of the stdio channels. It is the most secure option for passing a passphrase to gpg other than letting gpg prompt for it by itself.

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