ssh public key authentication problem using curl

Tue Nov 1 20:24:00 GMT 2011

After setup with ssh-host-config, ssh-user-config, and ssh-copy-id, 
public key authentication works with ssh but fails with curl. (Password 
authentication works with curl -u, but is less convenient.)
curl -v shows:
 SSH authentication methods available: 
publickey,password,keyboard-interactive
 Using ssh public key file /home/cdr/.ssh/id_dsa.pub
 Using ssh private key file /home/cdr/.ssh/id_dsa
 SSH public key authentication failed: Username/PublicKey combination 
invalid
 Authentication failure
However, ssh authenticates OK using RSA. ssh -v shows:
 Next authentication method: publickey
 Offering public key: /home/cdr/.ssh/id_rsa
 Server accepts key: pkalg ssh-rsa blen 279
 read PEM private key done: type RSA
 Authentication succeeded (publickey).
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