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DNSSEC-KEYGEN(8)                     BIND9                    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 mandatory.

          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

       -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) DNSKEY.

       -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 2.

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

       -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 possible
          values for this argument are listed in RFC 2535 and its successors.

       -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 DNSSEC.

       -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

       -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.

       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.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 equivalent.

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

       dnssec-keygen -a DSA -b 768 -n ZONE

       The command would print a string of the form:

       In this example, dnssec-keygen creates the files and

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

       Internet Systems Consortium

       Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")

BIND9                            June 30, 2000                DNSSEC-KEYGEN(8)


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