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To prevent your passwords from being hacked by social engineering, brute force or dictionary attack method, you should notice that:

1. Do not use the same password for multiple important accounts.

2. Use a password that has at least 15 characters, use at least one number, one uppercase letter, one lowercase letter and one special symbol.

3. Do not use the names of your families, friends or pets in your passwords.

4. Do not use postcodes, house numbers, phone numbers, birthdates, ID card numbers, social security numbers, and so on in your passwords.

5. Do not use any dictionary word in your passwords.

6. Do not let your Web browsers( FireFox, Chrome, Safari, Opera, IE ) store your passwords, since all passwords saved in Web browsers can be revealed easily.

7. Do not log in to important accounts on the computers of others, or when connected to a public Wi-Fi hotspot, Tor, free VPN or web proxy.

8. Do not send sensitive information online via HTTP or FTP connections, because messages in these connections can be sniffed with very little effort. You should use encrypted connections such as HTTPS and SFTP whenever possible.

9. When travelling, you can encrypt your Internet connections before they leave your laptop, tablet, mobile phone or router. For example, you can set up a private VPN on your own server( home computer, dedicated server or VPS ) and connect to it. Alternatively, you can set up an encrypted SSH tunnel between your router and your home computer( or a remote server of your own ) with PuTTY and connect your programs( e.g. FireFox ) to PuTTY. Then even if somebody captures your data as it is transmitted between your device( e.g. laptop, iPhone, iPad ) and your server with a packet sniffer, he'll won't be able to steal your data and passwords from the encrypted streaming data.

10. How secure is my password? Perhaps you believe that your passwords are very strong, difficult to hack. But if a hacker has stolen your username and the MD5 hash value of your password from a company's server, and the rainbow table of the hacker contains this MD5 hash, then your password will be cracked quickly.

     To check the strength of your passwords and know whether they're inside the popular rainbow tables, you can convert your passwords to MD5 hashes, then decrypt your passwords by submitting these hashes online, just search these keywords: online MD5, MD5 decryption online. For instance, your password is "0123456789A", using the brute-force method, it may take a computer almost one year to crack your password, but if you decrypt it by submitting its MD5 hash( C8E7279CD035B23BB9C0F1F954DFF5B3 ) to a MD5 decryption service, how long will it take to crack it? You can perform the test yourself.

11. It's recommended to change your passwords every 10 weeks.

12. It's recommended that you remember a few master passwords, store other passwords in a plain text file and encrypt this file with 7-Zip, GPG or a disk encryption software such as BitLocker, or manage your passwords with a password management software.

13. Turn on 2-step authentication whenever possible.

14. Do not store your critical passwords in the cloud.

15. Access important websites( e.g. Paypal ) from bookmarks directly, otherwise please check its domain name carefully, it's a good idea to check the popularity of a website with Alexa toolbar to ensure that it's not a phishing site before entering your password.

16. Protect your computer with firewall and antivirus software, download software from reputable sites only, and verify the MD5 or SHA1 checksum of the installation package whenever possible.

17. If you're a webmaster, do not store the users passwords in the database, you should store the salted hash values of passwords instead.

18. Do not use something that can be cloned( but you can't change ) as your passwords, such as your fingerprints.

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