SSH - Host Key (or Ssh Public Key)

Card Puncher Data Processing


host keys are just ordinary SSH key pairs. Each host can have one host key for each algorithm.

You should get an SSH host key fingerprint along with your credentials from a server administrator in order to prevent man-in-the-middle attacks.

Host Key Not Cached Putty



The host keys are usually automatically generated when an SSH server is installed but you can recreate them on the server with keygen

ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key
2048 0d:f4:2e:7b:be:e1:4c:0b:06:52:2b:4d:a4:51:1f:74 /etc/ssh/ (RSA)

  • Others
ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key
ssh-keygen -l -f /etc/ssh/ssh_host_ecdsa_key




On the server: Host keys are stored in the /etc/ssh/ directory.

Key Pair

The host keys are almost always stored in the following files:


ls /etc/ssh/*.pub

cat /etc/ssh/
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDwnFlKBk9t/pfd7vQGBrk+JNghDFJRa7G0rLrIoXUTtxconS7qZsZyTfEeh+l2cowWpKxpf03KyxouT7B3IdNjwXWHNKloQcE/8FYLhlcVw+Aicji5oUMdTfTberzCluYIyz4PUwE8rmgNejQbVLhl+lOfoacPMUJ4P6ahQ71WFTmFTEZ+CFnAmHeqtG7scl53DkICnXPkZ+57ymh1WM9h0kYFxVcZBXg7BOZpI/wrXkuWRXU6wpYHS481q/pjJTiLXZGIQhcXg1/inOCMgC1B9W92Rq/aviknWSS98/xQi2JbduG7Jw9Dn523Rs3nutUAQ6CMK7owjVtnvb54Bs1B root@buildbot-bbiwebhosting-builder-wheezy-amd64



The fingerpint of a public key consists of the MD5 of the public key. This is the same data that is base64 encoded to form the body of the public key file.

See The Secure Shell (SSH) Public Key File Format

Documentation / Reference

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Card Puncher Data Processing
SSH - Known Hosts File

Known Hosts File is a client file that lists all known remote host and is used by the ssh client where: algo public_key is the public key of the host keys from sshd home\.ssh\known_hosts...

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