DNSSEC-KEYGEN(8)                                              DNSSEC-KEYGEN(8)

       dnssec-keygen - DNSSEC key generation tool

       dnssec-keygen -a algorithm -b keysize -n nametype [ -c class ]  [ -e ]
       [ -g generator ]  [ -h ]  [ -p protocol ]  [ -r randomdev ]  [ -s
       strength ]  [ -t type ]  [ -v level ]  name

       dnssec-keygen generates keys for DNSSEC (Secure DNS), as defined in RFC
       2535. It can also generate keys for use with TSIG (Transaction
       Signatures), as defined in RFC 2845.

       -a algorithm
              Selects the cryptographic algorithm. The value of algorithm must
              be one of RSAMD5 or RSA, DSA, DH (Diffie Hellman), or HMAC-MD5.
              These values are case insensitive.

              Note that for DNSSEC, DSA is a mandatory to implement algorithm,
              and RSA is recommended. For TSIG, HMAC-MD5 is mandatory.

       -b keysize
              Specifies the number of bits in the key. The choice of key size
              depends on the algorithm used. RSA keys must be between 512 and
              2048 bits. Diffie Hellman keys must be between 128 and 4096
              bits. DSA keys must be between 512 and 1024 bits and an exact
              multiple of 64. HMAC-MD5 keys must be between 1 and 512 bits.

       -n nametype
              Specifies the owner type of the key. The value of nametype must
              either be ZONE (for a DNSSEC zone key), HOST or ENTITY (for a
              key associated with a host), or USER (for a key associated with
              a user). These values are case insensitive.

       -c class
              Indicates that the DNS record containing the key should have the
              specified class. If not specified, class IN is used.

       -e     If generating an RSA key, use a large exponent.

       -g generator
              If generating a Diffie Hellman key, use this generator.  Allowed
              values are 2 and 5. If no generator is specified, a known prime
              from RFC 2539 will be used if possible; otherwise the default is

       -h     Prints a short summary of the options and arguments to dnssec-

       -p protocol
              Sets the protocol value for the generated key. The protocol is a
              number between 0 and 255. The default is 2 (email) for keys of
              type USER and 3 (DNSSEC) for all other key types.  Other
              possible values for this argument are listed in RFC 2535 and its

       -r randomdev
              Specifies the source of randomness. If the operating system does
              not provide a /dev/random or equivalent device, the default
              source of randomness is keyboard input. randomdev specifies the
              name of a character device or file containing random data to be
              used instead of the default. The special value keyboard
              indicates that keyboard input should be used.

       -s strength
              Specifies the strength value of the key. The strength is a
              number between 0 and 15, and currently has no defined purpose in

       -t type
              Indicates the use of the key. type must be one of AUTHCONF,
              NOAUTHCONF, NOAUTH, or NOCONF. The default is AUTHCONF. AUTH
              refers to the ability to authenticate data, and CONF the ability
              to encrypt data.

       -v level
              Sets the debugging level.

       When dnssec-keygen completes successfully, it prints a string of the
       form Knnnn.+aaa+iiiii to the standard output. This is an identification
       string for the key it has generated. These strings can be used as
       arguments to dnssec-makekeyset.

       • nnnn is the key name.

       • aaa is the numeric representation of the algorithm.

       • iiiii is the key identifier (or footprint).

       dnssec-keygen creates two file, with names based on the printed string.
       Knnnn.+aaa+iiiii.key contains the public key, and
       Knnnn.+aaa+iiiii.private contains the private key.

       The .key file contains a DNS KEY record that can be inserted into a
       zone file (directly or with a $INCLUDE statement).

       The .private file contains algorithm specific fields. For obvious
       security reasons, this file does not have general read permission.

       Both .key and .private files are generated for symmetric encryption
       algorithm such as HMAC-MD5, even though the public and private key are

       To generate a 768-bit DSA key for the domain example.com, the following
       command would be issued:

       dnssec-keygen -a DSA -b 768 -n ZONE example.com

       The command would print a string of the form:


       In this example, dnssec-keygen creates the files
       Kexample.com.+003+26160.key and Kexample.com.+003+26160.private

       dnssec-makekeyset(8), dnssec-signkey(8), dnssec-signzone(8), BIND 9
       Administrator Reference Manual, RFC 2535, RFC 2845, RFC 2539.

       Internet Software Consortium

BIND9                            June 30, 2000                DNSSEC-KEYGEN(8)