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14.3.2. Support for SSH Certificates

Support for certificate authentication of users and hosts using the new OpenSSH certificate format was introduced in Red Hat Enterprise Linux 6.5, in the openssh-5.3p1-94.el6 package. If required, to ensure the latest OpenSSH package is installed, enter the following command as root:
~]# yum install openssh
Package openssh-5.3p1-104.el6_6.1.i686 already installed and latest version
Nothing to do