This file is indexed.

/etc/bind/bind.keys is in bind9 1:9.10.3.dfsg.P4-8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* $Id: bind.keys,v 1.7 2011/01/03 23:45:07 each Exp $ */
# The bind.keys file is used to override the built-in DNSSEC trust anchors
# which are included as part of BIND 9.  As of the current release, the only
# trust anchors it contains are those for the DNS root zone ("."), and for
# the ISC DNSSEC Lookaside Validation zone ("dlv.isc.org").  Trust anchors
# for any other zones MUST be configured elsewhere; if they are configured
# here, they will not be recognized or used by named.
#
# The built-in trust anchors are provided for convenience of configuration.
# They are not activated within named.conf unless specifically switched on.
# To use the built-in root key, set "dnssec-validation auto;" in
# named.conf options.  To use the built-in DLV key, set
# "dnssec-lookaside auto;".  Without these options being set,
# the keys in this file are ignored.
#
# This file is NOT expected to be user-configured.
#
# These keys are current as of January 2011.  If any key fails to
# initialize correctly, it may have expired.  In that event you should
# replace this file with a current version.  The latest version of
# bind.keys can always be obtained from ISC at https://www.isc.org/bind-keys.

managed-keys {
	# ISC DLV: See https://www.isc.org/solutions/dlv for details.
        # NOTE: This key is activated by setting "dnssec-lookaside auto;"
        # in named.conf.
	dlv.isc.org. initial-key 257 3 5 "BEAAAAPHMu/5onzrEE7z1egmhg/WPO0+juoZrW3euWEn4MxDCE1+lLy2
		brhQv5rN32RKtMzX6Mj70jdzeND4XknW58dnJNPCxn8+jAGl2FZLK8t+
		1uq4W+nnA3qO2+DL+k6BD4mewMLbIYFwe0PG73Te9fZ2kJb56dhgMde5
		ymX4BI/oQ+cAK50/xvJv00Frf8kw6ucMTwFlgPe+jnGxPPEmHAte/URk
		Y62ZfkLoBAADLHQ9IrS2tryAe7mbBZVcOwIeU/Rw/mRx/vwwMCTgNboM
		QKtUdvNXDrYJDSHZws3xiRXF1Rf+al9UmZfSav/4NWLKjHzpT59k/VSt
		TDN0YUuWrBNh";

	# ROOT KEY: See https://data.iana.org/root-anchors/root-anchors.xml
	# for current trust anchor information.
        # NOTE: This key is activated by setting "dnssec-validation auto;"
        # in named.conf.
	. initial-key 257 3 8 "AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQbSEW0O8gcCjF
		FVQUTf6v58fLjwBd0YI0EzrAcQqBGCzh/RStIoO8g0NfnfL2MTJRkxoX
		bfDaUeVPQuYEhg37NZWAJQ9VnMVDxP/VHL496M/QZxkjf5/Efucp2gaD
		X6RS6CXpoY68LsvPVjR0ZSwzz1apAzvN9dlzEheX7ICJBBtuA6G3LQpz
		W5hOA2hzCTMjJPJ8LbqF6dsV6DoBQzgul0sGIcGOYl7OyQdXfZ57relS
		Qageu+ipAdTTJ25AsRTAoub8ONGcLmqrAmRLKBP1dfwhYB4N7knNnulq
		QxA+Uk1ihz0=";
};