If you do not enter the dsa keyword, the crypto key generate command generates a DSA key pair by default. To enable SSH, you generate a DSA or RSA host key on the device. The SSH server on the ICX device uses this host DSA or RSA key, along with a dynamically generated server DSA or RSA key pair.
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How many bits in the modulus 512: 512% Rsa keys cannot be generated, as system clock is invalid cryptolibkeypairget failed to get RouterD.inter-vlan.com RouterD(config)#crypto key generate rsa general-keys? Exportable Allow the key to be exported label Provide a label modulus Provide number of modulus bits on the command line storage. Action 1.3 cli command 'crypto key generate rsa modulus 2048' action 1.4 cli command 'interface GigabitEthernet0/0' action 1.5 cli command 'no shut' action 1.6 cli command 'exit' action 1.7 cli command 'end' action 1.8 cli command 'write mem' I think. Aug 25, 2016 Switch (config)# crypto key generate rsa Enables the SSH server for local and remote authentication on the Switch and generates an RSA key pair. Generating an RSA key pair for the Switch automatically enables SSH. We recommend that a minimum modulus size of 1024 bits. When you generate RSA keys, you are prompted to enter a modulus length.
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While Encrypting a File with a Password from the Command Line using OpenSSLis very useful in its own right, the real power of the OpenSSL library is itsability to support the use of public key cryptograph for encrypting orvalidating data in an unattended manner (where the password is not required toencrypt) is done with public keys.
The Commands to RunGenerate a 2048 bit RSA Key
You can generate a public and private RSA key pair like this:
openssl genrsa -des3 -out private.pem 2048
How To Generate Rsa Key
That generates a 2048-bit RSA key pair, encrypts them with a password you provideand writes them to a file. You need to next extract the public key file. You willuse this, for instance, on your web server to encrypt content so that it canonly be read with the private key.
Export the RSA Public Key to a File
This is a command that is
openssl rsa -in private.pem -outform PEM -pubout -out public.pem
The
-pubout flag is really important. Be sure to include it.
Next open the
public.pem and ensure that it starts with-----BEGIN PUBLIC KEY----- . This is how you know that this file is thepublic key of the pair and not a private key.
To check the file from the command line you can use the
less command, like this:
less public.pem
Do Not Run This, it Exports the Private Key
A previous version of the post gave this example in error.
openssl rsa -in private.pem -out private_unencrypted.pem -outform PEM
The error is that the
-pubout was dropped from the end of the command.That changes the meaning of the command from that of exporting the public keyto exporting the private key outside of its encrypted wrapper. Inspecting theoutput file, in this case private_unencrypted.pem clearly shows that the keyis a RSA private key as it starts with -----BEGIN RSA PRIVATE KEY----- .
Visually Inspect Your Key Files
It is important to visually inspect you private and public key files to makesure that they are what you expect. OpenSSL will clearly explain the nature ofthe key block with a
-----BEGIN RSA PRIVATE KEY----- or -----BEGIN PUBLIC KEY----- .
You can use less to inspect each of your two files in turn:
The next section shows a full example of what each key file should look like.
The Generated Key Files
The generated files are base64-encoded encryption keys in plain text format.If you select a password for your private key, its file will be encrypted withyour password. Be sure to remember this password or the key pair becomes useless.
The private.pem file looks something like this:The public key, public.pem, file looks like:Protecting Your Keys![]() Crypto Key Generate Rsa Modulus 2048
Depending on the nature of the information you will protect, it’s important tokeep the private key backed up and secret. The public key can be distributedanywhere or embedded in your web application scripts, such as in your PHP,Ruby, or other scripts. Again, backup your keys!
Remember, if the key goes away the data encrypted to it is gone. Keeping aprinted copy of the key material in a sealed envelope in a bank safety depositbox is a good way to protect important keys against loss due to fire or harddrive failure.
Oh, and one last thing.
If you, dear reader, were planning any funny business with the private key that I have just published here. Know that they were made especially for this series of blog posts. I do not use them for anything else.
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