How Password Hashes Work in Linux, and Scripting Password Changes with Hashes

Covers /etc/shadow, salts, hashes, using chpasswd to change passwords directly with hashes in scripts, generating sha512 hashes with python, copying hashes between servers, etc.

[louman]

Wow. Best examples and explanations on hashes I've ever heard. Great demonstration. God Bless you!

[meksaldi]

Why there are not milions of views but just a few hundreds? Ofcourse people like stupid things like gaming and a lot of celebrity stuff to live their lives perfectly. What a shame to live in such a society!

Anyways Brian, amazing video, gonna watch them all :D

[djsensacion]

This is a great video ! Thanks for the clear and informative explanation

[jodyhoagland]

I would be interested to see about adding progress bars I. Scripts for parts that my take some time to complete. Like file copies using rsync or doing multiple rpm installs under the cover, but only showing steps completed and progress. Up for it?

[stanislasmayor]

Very intresting video, and i thank you for what you doing. I like to spend 10 minutes for learning something useful. Please keep going 

[joakim]

Great video, but would appreciate if you elaborated on exactly why hashes are one-way operations

[chenyu]

Thanks Brian! I still not quite understand the example, say, if two person have the same password, then they got the same hash, so what?

[ShivamSingh-qzso]

sir i seen in /etc/shadow files, its have 9 fields, it this right??

[changethisonceamonth]

Has nobody noticed the huge flaw in the logic? To run the script (the script to change the password "echo root:'hash' | chpasswd -e" ) on the remote server the script must logon to the remote server. How will said script be provided with credentials to logon to the remote server? Unless ssh keys are used the script (to change the password) WILL contain the password in clear text! Please clarify this.

[creonte]

Ok if I want to use argon2, blake2, pbkdf2? How can I do for the linux recognize cost? Because linux did not have this element in his shadow
 presentation.

[AbdirashidMuhammedRashka]

Hi! Can you please make a video about Linux Password Security with pam_cracklib? That would be wonderful!