Signature created on 5/19/17 3:20 PM using an unknown certificate with fingerprint 96EC 9E72 8272 B158 054B 6A31 10F5 C047 999C 3545 You can search the certificate on a keyserver or import it from a file.
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OpenPGP Key
This is an OpenPGP key, which can be used to sign or encrypt emails.