Getting the encryption/has algorithm used for modem configuration file Hello guys I have backed up my modem configuration file and found the username and password is in clear text; the files shows the username and the password is : 

password=_DEV_4FC6EA6A****************************


how do I get which encryption or hash algorithm is used to generate the given string and how strong it is?
You cannot; most (symmetric) encryption routines create output that is indistinguishable from random. This is however more likely to be the output of a password hash. The only thing you can say is that the result is 24 bytes. That 24 bytes hopefully contains a fully random salt (mostly 8 bytes) and a hash or password hash. In that case it's probably MD5 as there are only 16 bytes left. It could also be the output of SHA-224 directly over the password, or a HMAC using SHA-224 or similar with a device specific key.

If it is salt | MD5 or just SHA-224 is of course something you could test yourself. You could do this using your own password or - possibly - a dictionary attack. Note however that the password should now be changed ASAP as anybody can perform a dictionary attack.