![]() Here is a one-liner you can use to take advantage of it.Applies to Windows Server 2022, Windows Server 2019, Windows 10 (build 1809 and later) That same command can be combined with a neat feature of GitHub, which is the fact that they publicly serve users' SSH public keys at You will notice that you get the same fingerprint for both the private and public keys. ![]() If you want to check an SSH key file to see if it is the same as what is reported as the "Deploy key" by github, this is for you. But if it’s 40 hex digits, it’s actually a fingerprint computed by taking the SHA1 of the private key in PKCS#8 format: $ openssl pkcs8 -in foo -nocrypt -topk8 -outform DER | openssl sha1 -cĮ2:77:39:d3:53:a7:62:68:5f:da:82:0e:99:61:30:64:a2:88:c4:58 If it’s a 32-digit hex string, it’s the standard MD5 SSH public key fingerprint above. Unfortunately that may be a different beast. However, if you’re dealing with the fingerprints that Amazon shows in the EC2 Key Pairs console, The key is generated, only without the separating colons. Ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDEbKq5U57fhzQ3SBbs3NVmgY2ouYZfPhc6cXBNEFpRT3T100fnbkYw EHi76nwsp uGxk08kh4GG881DrgotptrJj2dJxXpWp/SFdVu5S9fFU6l6dCTC9IBYYCCV8PvXbBZ3oDZyyyJT7/vXSaUdbk3x9MeNlYrgItm2KY6MdHYEg8R994Sspn1sE4Ydey5DfG/WNWVrzFCI0sWI3yj4zuCcUXFz9sEG8fIYikD9rNuohiMenWjkj6oLTwZGVW2q4wRL0051XBkmfnPD/H6gqOML9MbZQ8D6/ az0yF9oD61SkifhBNBRRNaIab/Np7XD61siR8zNMG/vCKjFGICnp echo 'AAAAB3NzaC1yc2EAAAADAQABAAABAQDEbKq5U57fhzQ3SBbs3NVmgY2ouYZfPhc6cXBNEFpRT3T100fnbkYw EHi76nwsp uGxk08kh4GG881DrgotptrJj2dJxXpWp/SFdVu5S9fFU6l6dCTC9IBYYCCV8PvXbBZ3oDZyyyJT7/vXSaUdbk3x9MeNlYrgItm2KY6MdHYEg8R994Sspn1sE4Ydey5DfG/WNWVrzFCI0sWI3yj4zuCcUXFz9sEG8fIYikD9rNuohiMenWjkj6oLTwZGVW2q4wRL0051XBkmfnPD/H6gqOML9MbZQ8D6/ az0yF9oD61SkifhBNBRRNaIab/Np7XD61siR8zNMG/vCKjFGICnp' \ Your identification has been saved in foo. $ ssh-keygen -f fooĮnter passphrase (empty for no passphrase): The fingerprint is the MD5 over the binary data within the Base64-encoded public key. Though most of the time this is harmless, it can be an indication of a potential issue. This may not be a bad thing (happens from re-installing ssh), but it could also indicate that you are connecting to a different machine at the same domain/IP (happens when you are connecting through something like a load balancer) or that you are being targeted with a man-in-the-middle attack, where the attacker is somehow intercepting/rerouting your ssh connection to connect to a different host which could be snooping your username/password.īottom line: if you get warned of a changed fingerprint, be cautious and double check that you're actually connecting to the correct host over a secure connection. ![]() ![]() If the fingerprint changes, the machine you are connecting to has changed their public key. Generally it's for easy identification/verification The fingerprint is based on the host's public key, usually based on ![]()
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