This file is indexed.

/etc/ipsec.secrets is in strongswan-starter 5.6.2-1ubuntu2.

This file is owned by root:root, with mode 0o600.

The actual contents of the file can be viewed below.

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# This file holds shared secrets or RSA private keys for authentication.

# RSA private key for this host, authenticating it to any other host
# which knows the public part.