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Should you use multiple SSH keys?
You only need one key as the key belongs to your user. There is no need (and no improvement in security) by having one key per host. As long as your private key is kept private you can go with this single key and use it to authenticate yourself against multiple hosts.
Is it bad to have multiple SSH keys?
You use SSH for connecting to remote servers, which also includes managing your code using Git and syncing with remote repositories. Even though it is considered a good practice to have one private-public key pair per device, sometimes you need to use multiple keys and/or you have unorthodox key names.
Are public private key pairs unique?
Yes, every key pair will be unique, with well above 99.99999% probability. This is largely due to the size of the key space and the quality of the CSPRNG that is used (see below).
Can I have multiple ssh private keys?
You can have different private keys in different files and specify all of them in ~/. ssh/config using separate IdentityFile values (or using -i option while running ssh ). They would be tried in sequence (checkout man 5 ssh_config ).
Do you need a public key to use a keypair?
The public key doesn’t matter much, since, by definition, it can be publicised. So the only issue is the privacy of your private keys. They’re on your own machine, and all together, so if one is compromised, it’s likely that they’ll all be compromised. Therefore, multiple keypairs is just more work for the same effect.
Can a person guess a private encryption key?
A person cannot guess the private key based on knowing the public key. Because of this, a public key can be freely shared. The private key however belongs to only one person. There are several well-known mathematical algorithms that are used to produce the public and private key.
What’s the difference between a public and private key?
Public key vs. private key. The main difference between a public and a private key is their use. The public key , as its name implies, is public and open to anyone in the system. The public key is used to encrypt data. The private key however is private. It is only ever stored on user’s device.
Can a server generate its own public key?
If I understand properly, each server is going to have its own public key. For a given user, you can generate one key and use it everywhere, so long as the private key is replicated across to all initiating hosts.