Public key cryptography

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Generate a public key from a PEM private key

• openssl rsa -in mykey.pem -pubout > mykey.pub

Generate fingerpring

• ssh-keygen -l -f /etc/ssh/ssh_host_XXXXkey.pub

Generate public key from private key:

• ssh-keygen -y -f ~/.ssh/id_rsa > ~./.ssh/id_rsa.pub

Related terms

• ssh-copy-id
• ssh-keygen
• puttygen
• sshd logs: Failed publickey for
• Athena IDProtect card
• Minerva attack
• Cisco IOS: Configure public RSA key authentication

See also

• SSH: ssh, TLS, .ppk, .pem, .crt, .pub, ED25519, Key exchange method (KEX), public key, private key, ssh -Q kex, IAMUserSSHKeys, known_hosts, ssh tunnel, Dropbear
• Public key certificate
• CA, Root Certificates, FreeIPA, PKI, OpenCA, Wildcard certificate, certtool, certbot (Let's Encrypt), certinfo (Cloudflare), ACME, Boulder, cfssl (Cloudflare), Public key certificate, public key, TLS and X.509, OCSP, Subject Alternative Name (SAN), openssl ca, Self signed certificate, CSR, keytool, ACM, KMS, aws acm, IdenTrust, multirootca, cert-manager, ca_cert_identifier