FAQ tagged as:

passwords

I get lots of e-bills (utility, telephone, Internet, mobile, cable and so on) in a PDF format for my small business and I need to forward those to my accountant. However, all PDFs files are password protected. I don’t want to share my account password with anyone to just open my bills. Evince is a PDF document viewer capable of displaying password protected files but it cannot remove the password. How do I remove a password from all PDFs under Ubuntu or any other Linux distribution in a batch mode?

{ 6 comments }

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?

{ 9 comments }

Q. Can you tell me more about unshadow and john command line tools? How does it protect my server from crackers?

{ 13 comments }

Q. How do I use htpasswd command to store username and passwords?
A. htpasswd is used to create and update the flat-files used to store usernames and password for basic authentication of HTTP users. If htpasswd cannot access a file, such as not being [...]

{ 4 comments }

Q. How do I telnet as the root user?

{ 5 comments }

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