Cuoi Be Bung

PGP supports message authentication and integrity checking. The latter is used to detect whether a message has been altered since it was completed (the message integrity property), and the former to determine whether it was actually sent by the person/entity claimed to be the sender (a digital signature). In PGP, these are used by default in conjunction with encryption, but can be applied to plaintext as well. The sender uses PGP to create a digital signature for the message with either the RSA or DSA signature algorithms. To do so, PGP computes a hash (also called a message digest) from the plaintext, and then creates the digital signature from that hash using the sender's private keys. Satan greets him: "Welcome Mr. Gates, we've been waiting for you. This will be your home for all eternity. You've been selfish, greedy and a big liar all your life. Now, since you've got me in a good mood, I'll be generous and give you a choice of three places in which you'll be locked up forever. Satan takes Bill to a huge lake of fire in which millions of poor souls are tormented and tortured. He then takes him to a massive coliseum where thousands of people are chased about and devoured by starving lions. Finally, he takes Bill to a tiny room in which there is a bottle of the finest wine sitting on a table. To Bill's delight, he sees a PC in the corner. Without hesitation, Bill says "I'll take this option." "Fine," says Satan, allowing Bill to enter the room. Satan locks the room after Bill. As he turns around, he bumps into Lucifer. "That was Bill Gates!" cried Lucifer. "Why did you give him the best place of all!" "That's what everyone thinks" snickered Satan. "The bottle has a hole in it!" "What about the PC?" "It's got Windows 95!" laughed Satan. "And it's missing three keys," "Which three?" "Control, Alt and Delete." Did you know that heaven and hell are actually right next to each other? They are seperated by a big chain-link fence. Well, one day hell was having a big party and it got a little out of hand. God heard the ruckus and arrived to find his fence completely smashed by the wild partiers. He called the devil over and said "Look, Satan, you have to rebuild this fence." Satan agreed. The next day God noticed that the devil had completely rebuilt the fence...but it was 2 feet further into heaven than before. "Satan!" beckoned God. "You have to take that fence down and put it back where it belongs!" "Yeah? What if I don't?" replied the devil. "I'll sue you if I have to," answered God. "Sure," laughed Satan. "Where are you going to find a lawyer?"