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only gibberish. To decrypt the message, Gwen needs the key. Pao-Chi has the key, but how can he send it to Gwen He can t send it in another message; if Satomi can intercept the data message, she can also intercept the key message. And if Pao-Chi could find a channel to send the key securely, he could simply send the secret via that route. The problem facing Pao-Chi and Gwen is known as the key distribution problem namely, how can two or more people securely send keys over unsecure lines In more general terms, how can people securely send any sensitive information over unsecure lines Because we can encrypt the data, though, we can reduce the general problem to the smaller problem of securely sending the key. If you have 10MB of sensitive material, you could try to figure out a way to send that bulk data securely, or you could encrypt it using a 128-bit symmetric key and then try to come up with a way to securely send the key. If you solve the key distribution problem, you also solve the bulk data distribution problem (Figure 4-1).
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Figure 4-1 The key distribution problem: How can Pao-Chi send Gwen sensitive information, when Satomi might be eavesdropping
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In 3, you saw how Pao-Chi can encrypt bulk data with a session key and then store that key securely. He can store that key using, for example, PBE or a token. To solve the key distribution problem, Pao-Chi and Gwen can get together in advance to generate a key, and then each of them can store the key. To send secure messages to each other, they use the key to encrypt the data. So before Pao-Chi leaves on his trip, he stops by Gwen s office with his laptop. He generates a 128-bit key and stores it somehow maybe using PBE, maybe on a token. He then puts a copy of the key onto a floppy disk and hands Gwen the disk. She inserts the disk into her computer, copies the key, and stores it securely. Now the two parties share a key that they can use whenever they want to send sensitive material. This key, by the way, likely will not be the same key Pao-Chi uses to encrypt the files on his hard drive. If it were, Gwen could read all his sensitive data. If that s not OK with Pao-Chi, he has the option of encrypting his data using a key only he can access. If the two of them had chosen to exchange the key online, Pao-Chi would not have had to go to Gwen s office in person. But their goal is to send no sensitive data in the clear over unsecure lines, and that includes the company network. Even if the network is secure from outsiders, that doesn t eliminate the possibility of an inside job. Another employee maybe the system administrator or simply someone who is adept at hacking might be able to intercept such a key exchange. So the safest way to exchange the encrypting key in advance is to do so in person. Another possibility is for Pao-Chi to generate the key, encrypt it using PBE, and send the encrypted key to Gwen. Anyone intercepting the message would not be able to decrypt it without the password. Of course, Gwen needs the password, so Pao-Chi can give it to her by phone. In this way, the sensitive data (the password) is never sent over the network lines. But is the phone line secure Maybe, maybe not. Still, whoever wants to steal the key will have to break into both the network and the phone system. Although this makes the attacker s job more difficult, it still means sending sensitive data over unsecure lines.
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