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Configuring Secure Shell (SSH)
Further Information on SSH Client Public-Key Authentication
Bit Size
Exponent <e>
Figure 6-13. Example of a Client Public Key
Notes
Property
Supported
Value
Key Format
ASCII
Key Type
RSA only
Maximum Supported
3072 bits
Public Key Length
Maximum Key Size
1024
characters
6-24
To Create a Client-Public-Key Text File. These steps describe how to
copy client-public-keys into the switch for RSA challenge-response authenti-
cation, and require an understanding of how to use your SSH client applica-
tion.
Modulus <n>
Comments in public key files, such as smith@support.cairns.com in figure 6-13,
may appear in a SSH client application's generated public key. While such
comments may help to distinguish one key from another, they do not pose any
restriction on the use of a key by multiple clients and/or users.
Public key illustrations such as the key shown in figure 6-13 usually include
line breaks as a method for showing the whole key. However, in practice, line
breaks in a public key will cause errors resulting in authentication failure.
1.
Use your SSH client application to create a public/private key pair. Refer
to the documentation provided with your SSH client application for
details. The switch supports the following client-public-key properties:
Comments
See figure 6-7 on page 6-13. The key must be one unbroken ASCII string. If you add
more than one client-public-key to a file, terminate each key (except the last one)
with a <CR><LF>. Spaces are allowed within the key to delimit the key's components.
Note that, unlike the use of the switch's public key in an SSH client application, the
format of a client-public-key used by the switch does not include the client's IP
address.
Shorter key lengths allow faster operation, but also mean diminished security.
Includes the bit size, public index, modulus, any comments, <CR>, <LF>, and all blank
spaces.
If necessary, you can use an editor application to verify the size of a key. For example,
placing a client-public-key into a Word for Windows text file and clicking on File |
Properties | Statistics, lets you view the number of characters in the file, including
spaces.
Comment
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