Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, deep magic refers to techniques that are not widely known, and may be deliberately kept secret. The number of such techniques has arguably decreased in recent years, especially in the field of cryptography, many aspects of which are now open to public scrutiny. The Jargon File makes a distinction between deep magic, which refers to (code based on) esoteric theoretical knowledge; black magic, which refers to (code based on) techniques that appear to work but which lack a theoretical explanation; and heavy wizardry, which refers to (code based on) obscure or undocumented intricacies of particular hardware or software.

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