Tham khảo tài liệu 'open-source robotics and proces control cookbook edwards l 242p newnes elsevier 2005 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 4 Note that for copyright reasons I can t include any of the vendor-supplied BIOS customization utilities on the CD-ROM with this book I can only point out their existence and demonstrate to you what kind of things they can do. However these utilities are readily available by searching on the Internet. Unquestionably the definitive jumping-off point is http which carries many versions of the customization utilities for popular BIOSes for free download. Pay careful attention to the versioning information supplied with these utilities. Although the program will usually perform fairly thorough version-checking when loading a BIOS image there are so many subversions and sub-subversions of BIOS code each of which is virtually a custom product that caution is advisable. 208 CHAPTER Encryption and Data Security Primer Introduction It is impossible to build a trustworthy control network unless the topic of security is addressed and designed into the product from the beginning. Whether you are designing a system for your own use or for installation into some industrial or commercial application you will need to consider how to protect it against some level of attack from the outside world and how to protect recorded data from theft or forgery. Although data security involves physical procedural and other holistic aspects most security techniques in consumer and commercial applications are centered around adding encryption to existing protocols and data formats. This is primarily because encryption is cheap being provided by free software and it is also much easier to force users to run a secure version of a program with encryption features forced to be on than it is to get them to change their data security habits. Note that encryption technology really embraces two related topics protecting valuable data from being intercepted and read by people who aren t entitled to read it and authenticating transmissions so that commands from untrusted .
