DES( Data Encryption Standard)算法,于1977年得到美國政府的正式許可,是一種用56位密鑰來加密64位數(shù)據(jù)的方法。雖然56位密鑰的DES算法已經(jīng)風光不在,而且常有用Des加密的明文被破譯的報道,但是了解一下昔日美國的標準加密算法總是有益的,而且目前DES算法得到了廣泛的應(yīng)用
SOUNDSC(Y,...) is the same as SOUND(Y,...) except the data is
scaled so that the sound is played as loud as possible without
clipping. The mean of the data is removed.