gpg command

My cloud based backup service provider has ssh access to the backup system. How do I install and configure duplicity software for remote backups in incremental and encrypted format on Debian or Ubuntu Linux based desktop / laptop / server?

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How do I verify that the system using correct GPG keys to verify all patches, packages and update installed from RHN or repo under RHEL 5 or 6 server operating systems?

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I‘ve downloaded open source software from the Internet. The download server also provided me the PGP signature file. How do I verify that signature (file.tar.gz.asc) file against downloaded software release (software.version.tar.gz) under Linux / UNIX operating systems?

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