South African hacker history South African hacker history A brief history of computer hacking in South Africa. Note: A distinction needs to be made between a "white hat" hacker who hacks out of intellectual curiosity, and a "black hat" hacker who has ulterior motives. In recent times there has been an attempt to restore the meaning of the term hacker, which is still associated with creating code, and its secondary meaning, which has become the stuff of Hollywood legend. The term "cracker" is a better description for those who break into secured system by exploiting computer vulnerabilities. Activists are trapped by BOSS agents who
Cyclic prefix formula_17. Cyclic prefix In telecommunications, the term cyclic prefix refers to the prefixing of a symbol, with a repetition of the end. The receiver is typically configured to discard the cyclic prefix samples, but the cyclic prefix serves two purposes: For the cyclic prefix to serve its objectives, it must have a length at least equal to the length of the multipath channel. The concept of a cyclic prefix is traditionally associated with OFDM systems, however the cyclic prefix is now also used in single carrier systems to improve the robustness to multipath propagation. A cyclic prefix is often used