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The subject of cryptography is complex. They have a lot of classes in my college on cryptography and security in general. That does not mean cryptography is all hi tech. You can use it in low tech systems.
An algorithm is a technology to hide data. It is also called a cipher. The specification on the DES algorithm is 7 pages long. Time for another read I guess.
I plan to be writing about the lessons I learned from this book for a long time. My next post will start with different types of ciphers.