How to get batch processing working ?

[Deiter Scott]

  Just started the use of gnupg to replace our current encryption product.
We have 15 keys in the ring and many scheduled jobs that are completely
automated.
This on a sun box with solaris 8 os
below is a test script and the output.
I need to make this work without prompting
what am I missing.  Which doc is this explained 

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#!/usr/bin/ksh
#****************
# hsn3003d 
gpg --batch -d  HSN85005120900.pgp
echo 'returncode =' $?
exit
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testfred:/export/home/sdeiter/gnuaccept##    ./hsn3003d
gpg: can't query password in batchmode
gpg: encrypted with 1024-bit ELG-E key, ID 2EB7718F, created 1999-10-06
      "Keystone"
gpg: public key decryption failed: bad passphrase
gpg: decryption failed: secret key not available
returncode = 2
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