Linux / Unix: Cryptography Commands

Learn all about secure communication, data storage, commands that can be used to encrypt data and to create digital signatures under Max OS X, BSD, Linux, and Unix like operating systems (rss feed).

I need to generate a md5 hash for given string. It will be used by shell script to generate keys for remote web service or cryptographic application. How do I generate a md5 hash based on any input string under Linux or Unix like operating systems?

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I‘ve recently swiched from Ubuntu Linux to CentOS / RHEL / Scientific Linux version 6 gnome desktop. However, I’m unable to find the gpass the password manager for GNOME2 desktop in repo. How do I install the same under RHEL 6 or CentOS or Scientific Linux 6 or Fedora Linux 15?

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How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?

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I‘ve downloaded open source software from the Internet. The download server also provided me the PGP signature file. How do I verify that signature (file.tar.gz.asc) file against downloaded software release (software.version.tar.gz) under Linux / UNIX operating systems?

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How do I generate ssh keys under Linux / UNIX / Mac OS X and *BSD operating systems for remote login?

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