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

       dnssec-keygen - DNSSEC key generation tool

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

       dnssec-keygen generates keys for DNSSEC (Secure DNS), as defined in RFC
       2535 and RFC <TBA\>. 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 (RSA) or RSASHA1, DSA, DH (Diffie Hellman),  or
              HMAC-MD5. These values are case insensitive.

              Note  1:  that  for  DNSSEC, RSASHA1 is a mandatory to implement
              algorithm, and DSA is recommended. For TSIG, HMAC-MD5 is  manda-

              Note 2: HMAC-MD5 and DH automatically set the -k flag.

       -b keysize
              Specifies  the number of bits in the key. The choice of key size
              depends on the algorithm used. RSAMD5 /  RSASHA1  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 (KEY/DNSKEY)), HOST or
              ENTITY (for a key associated with a host (KEY)), USER (for a key
              associated with a user(KEY)) or OTHER (DNSKEY). 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 RSAMD5/RSASHA1 key, use a large exponent.

       -f flag
              Set  the  specified  flag  in  the  flag field of the KEY/DNSKEY
              record.  The only recognized  flag  is  KSK  (Key  Signing  Key)

       -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-

       -k     Generate KEY records rather than DNSKEY records.

       -p protocol
              Sets the protocol value for the generated key. The protocol is a
              number between 0 and 255. The default is 3 (DNSSEC).  Other pos-
              sible  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  indi-
              cates that keyboard input should be used.

       -s strength
              Specifies  the strength value of the key. The strength is a num-
              ber 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 argu-
       ments to dnssec-makekeyset.

       o nnnn is the key name.

       o aaa is the numeric representation of the algorithm.

       o 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.pri-
       vate 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 secu-
       rity 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    Kexam-
       ple.com.+003+26160.key and Kexample.com.+003+26160.private

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

       Internet Systems Consortium

BIND9                            June 30, 2000                DNSSEC-KEYGEN(8)