SSHFP record

A Secure Shell fingerprint record (abbreviated as SSHFP record) is a type of resource record in the Domain Name System (DNS) which identifies SSH keys that are associated with a host name. The acquisition of an SSHFP record needs to be secured with a mechanism such as DNSSEC for a chain of trust to be established.

Structure

<''Name''> [<''[[Time to Live|TTL]]''>] [<''Class''>] SSHFP <''[[Algorithm]]''> <''Type''> <''[[Hash function|Fingerprint]]''>

<Name>

The name of the object to which the resource record belongs (optional)

<TTL>

Time to live (in seconds). Validity of Resource Records (optional)

<Class>

Protocol group to which the resource record belongs (optional)

<Algorithm>

Algorithm (0: reserved; 1: RSA;[1] 2: DSA,[1] 3: ECDSA;[2] 4: Ed25519[3])

<Type>

Algorithm used to hash the public key (0: reserved; 1: SHA-1;[1] 2: SHA-256[2])

<Fingerprint>

Hexadecimal representation of the hash result, as text

Example

host.example.com.  SSHFP 2 1 123456789abcdef67890123456789abcdef67890

In this example, the host with the domain name host.example.com uses a DSA key with the SHA-1 fingerprint 123456789abcdef67890123456789abcdef67890.

See also

• List of DNS record types

References

1. "RFC 4255 — Using DNS to Securely Publish Secure Shell (SSH) Key Fingerprints". January 2006. Retrieved 2017-12-28.
2. "RFC 6594 — Use of the SHA-256 Algorithm with RSA, Digital Signature Algorithm (DSA), and Elliptic Curve DSA (ECDSA) in SSHFP Resource Records". April 2012. Retrieved 2017-12-28.
3. "RFC 7479 — Using Ed25519 in SSHFP Resource Records". March 2015. Retrieved 2017-12-28.