How do you create a RSA crypto key on a Cisco router?
Router1# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)# crypto key generate rsa The name for the keys will be: Router1.oreilly.com Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys.
To generate Rivest, Shamir, and Adelman (RSA) key pairs, use the crypto key generate rsa commandinglobal configuration mode.
The generate keyword places an RSA host key pair in the flash memory and enables SSH on the device, if it is not already enabled. The optional [modulus modulus-size ] parameter specifies the modulus size of the RSA key pair, in bits. The valid values for modulus-size are 1024 or 2048.
RSA private and public keys. An RSA key pair includes a private and a public key. The RSA private key is used to generate digital signatures, and the RSA public key is used to verify digital signatures. The RSA public key is also used for key encryption of DES or AES DATA keys and the RSA private key for key recovery.
Importing an RSA Key Container
You can use the Aspnet_regiis.exe tool with the –pi switch to import an RSA key container from an XML file. You must also specify whether the imported key container is a machine-level or user-level key container.
RSA algorithm is a popular exponentiation in a finite field over integers including prime numbers. The integers used by this method are sufficiently large making it difficult to solve. There are two sets of keys in this algorithm: private key and public key.
To create an encryption key, use the crypto key generate rsa general-keys modulus modulus-size command in global configuration mode. Step 3.
SSH Server
When you use the crypto key generate rsa command, it will ask you how many bits you want to use for the key size.
Using this understanding, we can use the ssh-keygen command to generate SSH key pairs using various algorithms and of varying lengths. We can then use these key pairs to authenticate automatically with applications that support SSH.
By default, the private key is stored in ~/. ssh/id_rsa and the public key is stored in ~/. ssh/id_rsa. pub .
How does an RSA key look like?
A RSA public key consists in two integers, the modulus (n) and the public exponent (e). It is normally encoded as an ASN. 1 structure that is a SEQUENCE of two INTEGER values.
- cat is a standard Unix utility that reads files and prints output.
- ~ Is your Home User path.
- /.ssh - your hidden directory contains all your ssh certificates.
- id_rsa. pub OR id_dsa. pub are RSA public keys, (the private key located on the client machine).
- ssh-keygen -t rsa -C "my-key" -f ~/.ssh/my-key.
- Generating public/private rsa key pair. ...
- aws ec2 import-key-pair --key-name "my-key" --public-key-material fileb://~/.ssh/my-key.pub.
- { "KeyName": "my-key", "KeyFingerprint": "1f:51:ae:28:bf:89:e9:d8:1f:25:5d:37:2d:7d:b8:ca" }
SSH Server
When you use the crypto key generate rsa command, it will ask you how many bits you want to use for the key size.
Using this understanding, we can use the ssh-keygen command to generate SSH key pairs using various algorithms and of varying lengths. We can then use these key pairs to authenticate automatically with applications that support SSH.
We can use the Cisco 'transport input' command to set which protocols are allowed to access the virtual terminal lines. We can choose from the following transport input command keywords to set the allowed protocols on the virtual terminal lines: ssh – allows TCP/IP SSH protocol only.
VTY is solely used for inbound connections to the device. These connections are all virtual with no hardware associated with them. Related Blog – VTY Password. The abstract “0 – 4” means that the device can allow 5 simultaneous virtual connections which may be Telnet or SSH.
