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Tiểu mục này bao gồm một bản tóm tắt những điểm nổi bật từ phần "Khái niệm cơ bản của mật mã" trong Security + Hướng dẫn học thi. Các thuật toán mã hóa đối xứng • Một thuật toán đối xứng sử dụng một chìa khóa cho cả hai mã hóa và giải mã. Nó còn được gọi là một khóa bí mật, một chìa khoá riêng, hoặc một mã hóa bí mật chia sẻ. | A Technical History of Apple s Operating Systems Amit Singh A Supplementary Document for Chapter 1 from the book Mac OS X Internals A Systems Approach. Copyright Amit Singh. All Rights Reserved. Portions Copyright Pearson Education. Document Version 2.0.1 July 28 2006 Latest version available at http osxbook.com book bonus chapter1 This page intentionally left blank. Dear Reader This is a supplementary document for Chapter 1 from my book Mac OS X Internals A Systems Approach. A subset about 30 of this document appears in the book as the first chapter with the title Origins of Mac OS X. This document is titled A Technical History of Apple s Operating Systems. Whereas the book s abridged version covers the history of Mac OS X this document s coverage is considerably broader. It encompasses not only Mac OS and its relevant ancestors but the various operating systems that Apple has dabbled with since the company s inception and many other systems that were direct or indirect sources of inspiration. This was the first chapter I wrote for the book. It was particularly difficult to write in terms of the time and other resources required in researching the material. I often had to find and scavenge ancient documentation software and hardware all actual screenshots shown in this document were captured first hand. However I couldn t include the chapter in its original form in the book. The book grew in size beyond everybody s expectations 1680 pages Therefore it was hard to justify the inclusion of this much history even if it is interesting history. I strongly believe that reading this document will help in understanding the evolution of Mac OS X and to some extent of some aspects of modern-day operating systems. An important reality of technology and of computing in particular is that many things that we think of as new ideas are not quite new. As Alan Kay once said Most ideas come from previous ideas. This is also true in the case of Mac OS X. As one digs the past of Mac
