I decided to try running fsck on a remote repo from a user account that doesn't have the GPG key used to encrypt with. I got this error, which isn't helpful. I think, at least, it should mention the possibility that there is a missing key.

ERROR: Unknown filter tag encountered: '\x8c\r\x04\x03\x03\x02n\x7fX8\xa5\xd7\xf1\xbd`\xc9[\xba\xc0\x11kU\xd0\x8f\xf3\r\x97J@\x0c\xc9\x11\xaan\xefxx\x89\xe9\x9b\xac\x96\xce \x1cD{:\x02\x10I\xda\xbb;\x0e\xac\xd3d9\x18(\x0c\xe4\x8a\xf89\xed\x9a!\x85\xd0t\xd0\xaa^0\xee\x17{\xe3\x9d\xa3\x89O\xc6\x04$c\x96\xee\xf3\xbb{.|\xd5\xb0\x96Z\xb3\x11\x0f&B\xf0'

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Someone else also reported this:

Minor improvement: using Obnam 1.0 on Debian Unstable, the error message when using an encrypted repository without specifying any key is not helpful. Please consider using a human-readable error message to warn the user that the key is missing (or wrong).

Here is an example of error message when using "obnam fsck" without the key:

Traceback (most recent call last):
[lots of debug info]
File "/usr/lib/python2.7/dist-packages/obnamlib/hooks.py", line 122, in run_filter_read
  tag, content = data.split("\0", 1)
ValueError: need more than 1 value to unpack

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Fixed in git now. done --liw