海冷不卡 CHAPTER2一 1950 CLASSICAL ENCRYPTION TECHNIQUES Many savages at the present day regard their names as vital parts of themselves,and therefore take great pains to conceal their real names,lest these should give to evil-disposed persons a handle by which to injure their owners. -The Golden Bough,Sir James George Frazer 甲=层 2022/10/9 Cryptography and Network Security-2 3/812022/10/9 Cryptography and Network Security - 2 3/81 Chapter 2 – Classical Encryption Techniques ⚫ Many savages at the present day regard their names as vital parts of themselves, and therefore take great pains to conceal their real names, lest these should give to evil-disposed persons a handle by which to injure their owners. —The Golden Bough, Sir James George Frazer