The NTP keys file

The keys file contains a list of numeric key IDs and key values. These IDs and values are used to verify that mode 6 and mode 7 NTP packets should be processed. For example, when running the xntpdc program, you must supply a valid key ID in response to the

Keyid prompt and its associated key value in response to the Password prompt. See ``Further examples of NTP'' for sample displays of this.

In addition to a key ID and its associated value, each entry also contains a one-letter code indicating the type of the key value. The precise format of an entry in the key file is:

key_ID key_type key_value

The three fields shown above are separated by any combination of blanks and tabs. Comments may appear on any line and must begin with the number sign (#).

The fields are:

• key ID, which is an arbitrary, unsigned 32-bit number, written in decimal. The range of possible values is zero through 4,294,967,295. Key IDs are specified by the requestkey and controlkey statements in the configuration file.

• key type, which identifies the type of key_value. Only one key format, ``M'', is currently supported. This indicates that the MD5 authentication scheme is being used.
  
  In this case, the key is a one-to-eight-character ASCII string. The one-letter code for this type is ``M''.

• key value, which is a 56-bit DES encryption key that is written as 8 octets. The key value always uses odd parity.

Below is a sample keys file:

   #
   #
   4       M    DonTTelL
   6       M    hElloWorld
   22      M    ImASecret

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