Bash Script works, but fails duing SSH/VNC Session

[RobinVossen]

I wrote a Small BashScript that encrypts a Directory using tar and gpg.
It runs fine on LocalHost but if called over VNC -> SSH I get a problem.
The Problem code is:

tar cf $1.tar $1  <-Here I make a tar file of the Directory
gpg -c $1.tar     <-Here I Encrypt the tar file

Anyhow, the Error I get is:

gpg: cannot open `/dev/tty': No such device or address

Can anyone tell me why that is? Why does it want to use /dev/tty? (It doesnt have that since its a OpenVZ box.
But then again, why should he have access to tty?
And why does it work on Localhost but not during a SSH session?

Thanks already.

[likwid]

Well I believe this happens because gpg uses the terminal as a source of entropy. There is a --no-tty option for gpg, but I've never actually had to use it, and from the manpage it looks like it may only be for output. It's worth trying out I'd say though

[RobinVossen]

THANKS!
I did try man gpg but I did read that you only may use one command..
Anyhow, I get

gpg: Sorry, no terminal at all requested - can't get input

now I changed it to:

gpg -c --no-tty $1.tar

[likwid]

I did a test and found it prompts for a passphrase, cause you have to sign it with a key- i think -u is the option. Do gpg --list-keys to see which ones you've got.

[RobinVossen]

Thanks
But I decided to go back to OpenSSL for Singel File Encryption.
It has a stronger Algorytmn. (Since its done by 6 / 8 Character Passwords instead of 256 / 512 bit keys)
Anyhow, thanks.

Cheers,
Robin