A Chicago winter separates the men from the boys, especially newcomers from milder climes. The temperature frequently plunges below zero.

Read the excerpt from the code book. other attacks include the use of viruses and trojan horses. eve might design a virus that infects pgp software and sits quietly inside alice's computer. when alice uses her private key to decrypt a message, the virus would wake up and make a note of it. the next time that alice connects to the internet, the virus would surreptitiously send the private key to eve, thereby allowing her to decipher all subsequent messages sent to alice. one way to better connect with this excerpt is to tell about an experience with a computer virus. define the specific details of a pgp virus. research decryption viruses on the internet. contrast viruses with trojan horse attacks.