• Cisco Crypto Key Generate Rsa Domain Registration
• Cisco Crypto Key Generate Rsa Domain Login
• Cisco Crypto Key Generate Rsa Domain Name

Jun 11, 2019  SW1 ( config)# crypto key generate rsa. How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportableOK Set the size of key to 1024 bits. If your Cisco Switch is running an older version of Cisco IOS image, then it is extremely recommended that you upgrade to latest Cisco IOS. Now we can generate the RSA keypair: R1(config)# crypto key generate rsa The name for the keys will be: R1.NETWORKLESSONS.LOCAL Choose the size of the key modulus in the range of 360 to 4096 for your General Purpose Keys.

Telnet versus SSH

Many people continue to use Telnet for sensitive applications or access to critical systems. Telnet is CLEARTEXT, so all the data, including the login id is visible is someone intercepts that session

Here’s what this looks like using Wireshark an Open Source Protocol Analyzer when we use the Follow TCP Stream feature in Wireshark.

The next characters are red (the character I typed) and blue (the characters echoed back)

You clearly see the User Verification Prompt.Here's the telnet trace file.

Below you can see me typing in my username;

In this screenshot below you can see me entering the commandenable and the the enable password.

How to Enable SSH Version 1 on Cisco

Before you can enable SSH you need to assign individual (or group) user IDs and passwords.

These are just login id's and are required regardless if you use Telnet or SSH.

To enable locally administered user IDs, use the following set of configuration commands. I would not suggest using the nopassword parameter.

Put your own data in the italized text.

Now when you telnet into the device you should see the Username prompt

Now that you have login id's created you can turn on SSH version 1.

To enable SSH, use the following set of configuration commands. I would not suggest using the nopassword parameter.

Put your own data in the italized text.

Cisco Crypto Key Generate Rsa Domain Registration

Cisco Crypto Key Generate Rsa Domain Login

Now we'll try to capture the SSH login and as you can see the login data is no longer in clear text. Here's the SSH 1 trace file.

The moral of the story is not to use Cleartext logins if the device or application is sensitive.

To upgrade to even more secure SSH version 2, type in the following commands

the SSH version 2 trace files are here

In this write up I used;

Cisco Crypto Key Generate Rsa Domain Name

• Wireshark Protocol Analyzer(free)

• Putty Telnet/SSH Client(free)

• Cisco Switch(not free) Avs video editor 7 activation key generator.