This file is indexed.

/lib/partman/active_partition/45cipher/choices is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

. /usr/share/debconf/confmodule

set -e

dev=$1
id=$2
part=$dev/$id

cd $dev

choice_cipher () {
	if [ -f $part/cipher ]; then
		cipher=$(cat $part/cipher)
	else
		db_metaget partman-basicfilesystems/text/no_mountpoint description
		cipher="$RET" # "none"
	fi

	db_metaget partman-crypto/text/specify_cipher description
	printf "encryption\t%s\${!TAB}%s\n" "$RET" "$cipher"
}

[ -f $part/method ] || exit 0

method=$(cat $part/method)
if [ $method = crypto ]; then
	choice_cipher
fi