What happens when the following command is run?
# authconfig – – passalgo = md5 – – update
A.
It produces the MD5 checksum of the input data.
B.
It configures the MD5 checksum for newly authored documents
C.
It converts the stdio input to MD5 algorithm.
D.
It changes the user password hashing algorithm to MD5.
Explanation:
To configure the Linux system to use theMD5algorithm, enter:
# authconfig –passalgo=MD5–update
Note: The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use
SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512
under CentOS or Redhat Enterprise Linux 5.4?
You need to use authconfig command to setup SHA-256/512 hashing. This command provides a
simple method of configuring /etc/sysconfig/network to handle NIS, as well as /etc/passwd and
/etc/shadow, the files used for shadow password support. Basic LDAP, Kerberos 5, and SMB
(authentication) client configuration is also provided.
Display Current Hashing Algorithm
Type the following command:
# authconfig –test | grep hashing
Sample outputs:
password hashing algorithm is md5
Configure Linux Server To Use The SHA-512
To configure the Linux system to use the SHA-512 algorithm, enter:
# authconfig –passalgo=sha512 –update
D