Public key cryptography

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wikipedia:Public key cryptography

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

OpenSSH 7.6 (2017)

• Refuse keys <1024 bits in lengh and improve reporting for keys that do not meet this requirement.

Related terms

• ssh-copy-id
• ssh-keygen and puttygen
• sshd logs: Failed publickey for
• Athena IDProtect card
• Minerva attack
• Cisco IOS: Configure public RSA key authentication
• Whitfield Diffie
• Key length
• RSA, DSA
• ECDSA: Bitcoin
• EdDSA: ed25519.
• SHA
• TLS, S/MIME, PGP, GPG

See also

• Public key cryptography, private key, public key, key length, ssh-keygen, ssh-keyscan, Root certificate, KEX, Generate a key
• 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 cryptography, Public key certificate, BLS digital signature
• 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
• Public-key cryptography: RSA, DSA, ECDSA, EdDSA (Ed25519), AES, RSA Conference, hash, pkeyutl, Signature, key length, Easyrsa, OAEP, Ron Rivest, Adi Shamir, Leonard Adleman