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decryption. A large integer, known as a key, is central to the encryption and decryption process and, depending on the algorithm, a different key may be used for encryption and decryption. Algorithms that use only a single key for encryption and decryption are called symmetric, while algorithms that use two separate keys are known as asymmetric. An individual user usually wants to encrypt their own data and ensure secrecy from everyone else, in which case a symmetric algorithm typically suffices. The drawback for sharing data secretly with multiple users is that once the key is known to one unauthorized user, then all users data is compromised. This is where asymmetric algorithms come into play the encoding key can be compromised, but the data will still be protected unless the decoding key is known to an attacker, because the decoding key cannot be derived from the encoding key. Given that much data in defense, commerce, and government spheres must be kept secret, it s little surprise that cryptography is what most lay people associate with security. However, as you ve seen from the other requirements of security in this chapter, secrecy is only one part of the overall equation if data is inauthentic, inaccurate, and lacks integrity, then there s little point in keeping it secret. This section examines basic aspects of how both symmetric and asymmetric cryptography are used in modern applications to ensure secrecy of data.

In UNIX, a simple symmetric key encryption system is made available through the crypt command. crypt takes a passphrase entered on the command line and uses it to encrypt plaintext from standard input. The plaintext is passed through a stream cipher, and crypt then sends the ciphertext to standard output. Consider a simple example. Imagine that a list of secret agents names is stored in a flat-file database called agents.txt. To protect these identities, you need to encrypt the data and store the ciphertext in a file called agents.crypt. You also need to select an appropriate passphrase in order to protect the data in this case, use a random string of 78hg65df. Thus, to encrypt the file, you would use the following command:

Since the contents of agents.crypt would contain binary data, you could view the ciphertext using the following command:

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To decrypt the ciphertext, and recover the plaintext, the crypt command can also be used. The passphrase 78hg65df will need to be supplied. If the passphrase is lost, then the data is not recoverable unless brute-force cracking is attempted.

Part III:

It looks like crypt solves all of your secrecy problems, but actually there are several problems with this simple scenario The first problem is that when the crypt command is executed, the passphrase appears in the clear in the process list, making it visible to any user who is scanning the list on a regular basis for the token crypt A cracker might be able to determine the average file size on the system and the average time it takes to encrypt that file size under an average system load If average encryption time for an average file is ten minutes, then a simple cron using the command ps eaf | grep crypt would intercept many of the crypt invocations These could be e-mailed to the attacker when detected, thereby bypassing the secrecy measures implemented.

Although simple, we see a number of emergent behaviors as a result of the simple interconnections of the above circuit. The first behavior that we see, is a light-seeking behavior. This means that our Photopopper will try to seek light and avoid shadow wherever possible. This behavior was exhibited in Grey Walter s turtle, an early robot which proved that a limited number of connections could give rise to more complex emerging behaviors. We can see the way the robot makes its way toward a light source in Figure 16-3. When we try and relate our mechanical robot beastie to the world of the animal kingdom, we can see that light is the food for our robot a natural animal instinct is to go where there is food in order to survive it is clear that this robot exhibits this behavior trait. Another behavior that our robot exhibits is obstacle avoidance behavior, where the robot tries as far as possible to avoid obstacles by using its whisker touch sensors (Figure 16-4). Again, we can relate this to the animal kingdom, where whiskered animals such as hamsters and cats sense obstructions with their sensitive whiskers and take evasive action to avoid those obstacles.

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