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VersaSync units have their initial host keys created at the factory. RSA host key sizes can

vary between 768 and 4096 bits. The recommended key size is 1024. Though many key

sizes are supported, it is recommended that users select key sizes that are powers of 2 or

divisible by 2. The most popular sizes are 768, 1024, and 2048. Large key sizes of up to

4096 are supported, but may take 10 minutes or more to generate. DSA keys size support

is limited to 1024 bits.

Host keys are generated in the background. Creating RSA and DSA keys, each with 1024

bits length, typically takes about 30 seconds. Keys are created in the order of RSA, DSA,

RSA. When the keys are created, you can successfully make SSH client connections. If the

unit is rebooted with host key creation in progress, or the unit is booted and no host keys

exist, the key generation process is restarted. The key generation process uses either the

previously specified key sizes or, if a key size is undefined, the default key bit length size

used is 2048. A key with a zero length or blank key size field is not created.

The SSH client utilities SSH, SCP, and SFTP allow for several modes of user authen-

tication. SSH allows you to remotely login or transfer files by identifying your account and

the target machine's IP address. As a user you can authenticate yourself by using your

account password, or by using a Public Private Key Pair.

It is advisable to keep your private key secret within your workstation or network user

account, and provide the VersaSync a copy of your public key. The modes of authen-

tication supported include:

Either Public Key with Passphrase or Login Account Password

Public Key with Passphrase only

SSH using public/private key authentication is the most secure authenticating method for

SSH, SCP or SFTP sessions.

You are required to create private and public key pairs on your workstation or within a

private area in your network account. These keys may be RSA or DSA and may be any key

bit length as supported by the SSH client tool. These public keys are stored in a file in the

.ssh directory named authorized_keys. The file is to be formatted such that the key is

followed by the optional comment with only one key per line.

Note: The file format, line terminations, and other EOL or EOF characters

should correspond to UNIX conventions, not Windows.

Changing Key Length Values

You may change the key length of the RSA, DSA, ECDSA type host keys.

To change the key length of a host key:

2.8 Configuring Network Settings

CHAPTER 2 • VersaSync User Manual Rev. 7.0

Orolia VersaSync User Manual

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