Engineering Concepts Tutorials

Engineering Concepts Tutorials for UML, Operations Research, Numerical Methods and many more.
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DKIM stands for DomainKeys Identified Mail, it helps associate a domain with an email message to help prove the authenticity of the message. DKIM is a successor of DomainKeys developed by Yahoo!, it was deprecated in 2007 but some providers still use it. DKIM was created by an informal group and...
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After Introduction to Git VCS, this is the second installment in the series, here we'll be see how to setup a workflow, copying repositories & maintaining a central repository to help developers/contributors collaborate. Cloning In most of the other version control systems, checking out is a...
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Memcached is a free & open-source, robust, fast & distributed memory object caching system. Memcached was originally developed by Brad Fitzpatrick for LiveJournal in 2003. Since then it has gone a long way and today top websites like Youtube, Facebook & Twitter use memcached. Memcached works on...
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The article extends the Cryptography concepts to explain the Symmetric Key encryption. Additionally, it throws light on the capabilities of Symmetric key encryption and its operational modes. Symmetric-Key encryption Symmetric key cryptography is encrypting or decrypting message using a...
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Amazon SQS (Simple Queue Service) is yet another amazing product from Amazon, which provides a reliable, easy & highly scalable hosted queue service for storing messages, which can be accessed by any computer on any network. This provides a way to simply move around messages between computers or...
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Git is popular distributed version control system, it was developed by inventor of Linux, Linus Torvalds. Git has been gaining huge popularity in the ope-source community as well as in the corporate world due to it's distributed nature and efficiency. I had a written a few articles on Git to...
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I have tried introducing people to Git VCS, both personally and through by articles at G4E, I have written 2 articles, Introduction to Git VCS & Git VCS - Cloning & Workflow, in this article Get A List Of Files Modified Between Two Commits At times working on a feature or an enhancement of an...
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Cryptography is "Art of writing or hiding secret". It is a science of protecting the information from theft or unauthorized access. To do so, important or confidential information is hided as or converted to some other form of gibberish data. Now original information can be recovered only by the...
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SPF or Sender Policy Framework is a system created to prevent e-mail spam & e-mail spoofing. It does so by verifying the sender's IP address is a authorized one for the domain the mail is originating from. SPF requires domain admins to add DNS TXT or SPF records specifying hosts/IPs allowed to...
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