I installed #raspbian lite img on my #raspberrypi yesterday from https://downloads.raspberrypi.org/raspbian_lite_latest
Checked the /etc/ssh/ keys and found very strange they were old…
Do you have the same SSH server keys than me ? 
root@raspberrypi:/etc/ssh# ls -l
total 288
-rw-r–r-- 1 root root 242091 jui 24 2016 moduli
-rw-r–r-- 1 root root 1690 jui 24 2016 ssh_config
-rw-r–r-- 1 root root 2541 nov 25 17:28 sshd_config
-rw------- 1 root root 668 nov 25 17:57 ssh_host_dsa_key
-rw-r–r-- 1 root root 606 nov 25 17:57 ssh_host_dsa_key.pub
-rw------- 1 root root 227 nov 25 17:57 ssh_host_ecdsa_key
-rw-r–r-- 1 root root 178 nov 25 17:57 ssh_host_ecdsa_key.pub
-rw------- 1 root root 411 nov 25 17:57 ssh_host_ed25519_key
-rw-r–r-- 1 root root 98 nov 25 17:57 ssh_host_ed25519_key.pub
-rw------- 1 root root 981 nov 25 17:56 ssh_host_key
-rw-r–r-- 1 root root 646 nov 25 17:56 ssh_host_key.pub
-rw------- 1 root root 1675 nov 25 17:57 ssh_host_rsa_key
-rw-r–r-- 1 root root 398 nov 25 17:57 ssh_host_rsa_key.pub
root@raspberrypi:/etc/ssh# sha512sum ssh_host_rsa_key
47f0f562a1bb23f4adf5649ba6aed2c63f3ef1c05d7e39ec33e4fd6446da99064d1a01b885d7714de88a638b163fd0cfcdf3ef990c91b6b62b1ab46b7fbf0a7a
ssh_host_rsa_key