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1024 bits is the default:Ĭiscoasa(config)# crypto key generate rsa modulus 2048 You can specify a modulus size of 512 bits, 768 bits, 1024 bits or 2048 bits. To generate RSA key pairs for identity certificates, use the crypto key generate rsa command.
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It is used to uniquely identify the ASA when the SSH client tries to establish a SSH connection to the SSH server (the ASA). SSH on the Cisco ASA requires the generation of a RSA keypair on the ASA. Let’s look at how SSH uses the host key to identify the ASA. This is the core of the trust model for SSH on the ASA. The SSH protocol also allows the ASA to identify itself via its host key. SSH will encrypt the traffic and thereby prevent eavesdropping. (ASDM version 6 and up is actually quite usable and stable.) Or, if you want a command line, you could set up your ASA to accept management connections via SSH. There are 2 methods can you use to manage an ASA securely: There’s the GUI management tool (ASDM) which is secured by HTTPS, providing encryption and secure server identification. The very idea gives you hives, yes? Excellent. You know better than to manage your ASA over Telnet. So Telnet provides no assurance of confidentiality or integrity. The attacker could even modify the packets that are sent during the communication. (Well, when you are sending everything in the clear, host identification is kinda like closing the convention center door after the Furries have bolted.) An attacker could intercept your packets on their way to the actual destination. Telnet does not provide a mechanism to verify the identity of the host that you are connecting to. I routinely mislabeled my shipments “farm machinery.” And I have yet to meet the lowly-paid customs official who will open a container marked “radioactive waste” to verify its contents.Īpart from the fact that Telnet sends everything in plaintext, Telnet is also vulnerable to man-in-the-middle attacks. Even when I was up against an overzealous agent, I had a number of methods for discouraging a search.