SSH Tectia 
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    About This Document >>
    Installing SSH Tectia Server for IBM z/OS >>
    Getting Started with SSH Tectia Server for IBM z/OS >>
    Configuring the Server >>
    Authentication >>
        Using the z/OS System Authorization Facility
        Server Authentication with Public Keys in File >>
            Defining Server Host Key
            Generating the Server Host Key Pair
            Using an OpenSSH Server Host Key
            Notifying the Users of the Host Key Change
        Server Authentication with Certificates >>
        User Authentication with Passwords
        User Authentication with Public Keys in File >>
        User Authentication with Certificates >>
        Host-Based User Authentication >>
        User Authentication with Keyboard-Interactive
    System Administration >>
    File Transfer Using SFTP >>
    Secure File Transfer Using Transparent FTP Security >>
    Tunneling >>
    Troubleshooting SSH Tectia Server for IBM z/OS >>
    Man Pages and Default Configuration Files >>
    Log Messages >>

Defining Server Host Key

The key pair used for server authentication is defined on the server in the sshd2_config file with the following parameters:

HostkeyFile              hostkey
PublicHostKeyFile        hostkey.pub

During the setup process, one RSA key pair (with the file names hostkey and hostkey.pub) is generated and stored in the /opt/tectia/etc/ directory. By default this key pair is used for server authentication. Make sure that only the user running sshd2 has access to the private key.

In SSH Tectia Server for IBM z/OS, each server daemon can have only one host key pair. This is different from SSH Tectia Server on other platforms.

By default, the server uses a public key with the filename of the private key plus the extension .pub. The PublicHostKeyFile keyword has to be defined only if the public-key file is stored with a different filename.

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