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/usr/share/initramfs-tools/conf-hooks.d/dropbear is in dropbear-initramfs 2016.74-5+deb9u1.

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# Override variables from /etc/initramfs-tools/initramfs.conf, see
# initramfs-tools(8)
#

# Set the umask value of the generated initramfs file to avoid
# disclosing SSH host keys.
UMASK=0077

# Force use of busybox instead of klibc utilities
BUSYBOX=y