What is Cryptography?
Cryptography is the art of making clear text illegible by anyone but the original recipients. It is an art that is at least as old as the Roman Repulic, when Julius Caesar used the Caesar cipher to encrypt orders to his centurions in the Gallic wars.
Since then, cryptography has evolved into a science unto itself, which helped kickstart computer science (and thus programming) during World War 2.
I encourage you to discover the history of cryptography. It makes for a good techno-thriller with lots of cloak-and-dagger.
The Two Areas of Cryptography
Cryptogrpahic algorithms are used in two main areas: Validation and encryption. Validation algorithms, or message/hash digests, provide a means to verify that data has not been modified somehow. A rather mundane use of this verification is testing the hash finger print of a file after a download to make sure that the file wasn’t corrupted during the transfer.
Encryption and decryption are used to prevent a third party from reading the message. Online banking or e-commerce websites use this to secure the communication between your browser and their servers when you send payment details.
Thu Aug 14, 2014 12:07 pm
shelly
Joined: 07 Nov 2013 Posts: 58
Very informative post. This is an excellent resource for all the people who wanted to learn all about the process of cryptography. Thank you for this great share.
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