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 4034. 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 insensitive. Defaults to ZONE for DNSKEY generation.

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

           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.

           Prints a short summary of the options and arguments to

           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 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.

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

       Internet Systems Consortium

       Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc.
       Copyright (C) 2000-2003 Internet Software Consortium.

BIND9                            June 30, 2000                DNSSEC-KEYGEN(8)

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