Bernardo B. Terrado[SMTP:bbt@mudspring.uplb.edu.ph] seemed to write:
What's the difference between compression and encryption?
Eh? Encryption means keeping things secret. Compression is keeping them small. Not the same thing at all. OK, they might use some of the same tools - but you can use a screwdriver to clean your nails.
Correct me if I'm wrong, in compression we lose something, like in image compression and audio compression, but in encryption, we don't.
Be corrected. You are wrong. There are ways of compressing that don't lose anything (like PKzip that you might have heard of...). There are ways of encrypting that don't compress. (in fact you might not want totally efficient compression in encryption because that might give an eavesdropper clues as to the real length of the plaintext which could be useful to them)
One sure protection againts evil hackers is encryption (?), but what if that evil hacker deletes the ciphertext file and the plain text file (that is assuming the evil hacker just deletes every file he wants to delete).
I go to the backup, that's what. If I care enough about a file to encrypt it I care enough about it to back it up. Your hacker is doing what they call a "denial of service" attack. Encrypting your files doesn't make any difference is someone deletes them. You need different defences against different kinds of attack. Or was all this some sort of troll...
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bbt@mudspring.uplb.edu.ph bbt@peak-two.uplb.edu.ph metaphone@altavista.net