I have 3 questions: 1) Aren't Audio CD's supposed to sound better than Audio cassettes? But how can that be? Firstly there will be some data-loss due to the sampling (depending of course on the sampling frquency, and the permissible size of each audio-file), regardless of the efficiency of the reconstruction circuitry+algorithm. Whereas on an audio-tape, the magnetic signals are modulated, but original and analog signals nevertheless. SHouldn't tapes(new ones, without any physical damage) therefore sound better than CD's? 2) I understand that image and audio compression can be carried out by rejecting a certain amount of reconstrucible/imperceptible data, but how does data compression (I mean exe's, text files etc.) occur? 3)Wherever I hear encryption I hear prime number in the same breath. I get it that prime numbers are one of the simplest(?, I could be terribly wrong here) and seemingly most secure means used to encrypt data, but won't some kind of a random encryption algorithm be more fool-proof? I mean one where the type of encryption depends on the word position in the file for example. Please clear these doubts of mine. I'm busy with my exams rite now, so I won't be able to check this thread for a coupla days. Keep the replies coming in anyway. Thanx 2 all in advance.