Tricks for choosing good password

[Landan]

I am new for Linux and when adjust some password for root or another user it indicate me for some warning. Password always been successful but what about those warnings ? What are rules of thumb to create good passwords? How would a DBA enforce those rules in Oracle? What business challenges might you encounter. How much beneficial this method would be for constructing a password.

[Devasis]

There are some simple rules and suggestion that would be beneficial to choose a good password :

1. The password length should be atleast eight characters long(minimum).
2. Always Try to choose some form of odd characters or digits.
3. Do not use those word which can be match from dictionary.
4. Don't use combination of keyboard letters, Like qwerty
5. Do try to use following things which can be easily guessed :
* Contact numbers.
* Vehicle registration number.
* Name of friends or any relatives
* Any memorable Date.
6. Never try to use your own A/C name as its password.
7. Use separate passwords for every machine.

[Solomon]

Try to combine more than two words and construct it your own way that can be remembered to you not for all.

Take a look on good examples which is using multiple words:

* gEt%L0st! - get lost!
* heLP4me$ - help for me

But it can be a bad one:

* T0gether - to get her

Using phrase:
* rsKf0myH - Raindrops keep falling on my head.
* wru2rxy? - Who are you to ask why.
* bWiIso3! - Beware the ides of March!

But it can be a bad one:

* Aaaaaaaa - Always assert an ambiguous axiom and argue aggressively.

[MrChris-]

You are using Linux and you have created a user and wanted to setup the password but Linux occur some warnings before accepting password what can be the reason.

When you are going to setup the password,Linux investigates the entered password using a complex algorithm. The Algorithm follow some guidelines and rules.
- Password should contain 6 to 8 characters including some complex combination and should be the combination of
* Lower case alphabetic
* Upper case alphabetic
* Numbers from 0 to 9
* Alphabetical Punctuation marks