FM 4-06 Chapter 4 · Security and crypto
SSH public key
Fingerprints, type and size of OpenSSH public keys, authorized_keys and known_hosts lines.
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One key per line. Options in front of the key (authorized_keys), host lists and @markers (known_hosts), hashed hosts and RFC 4716 blocks are understood. Lines starting with # are skipped.
Fingerprints match ssh-keygen -l: SHA256 over the key blob in base64 without padding, and the legacy MD5 form (ssh-keygen -E md5) as colon hex. For certificates the fingerprint is that of the certified key. RSA below 3072 bits is flagged as below current guidance, DSA as deprecated.