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By Gehman H. M.

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This should not be surprising: As stated in the introduction to this chapter, cryptography is close to a total security solution, but it is, in the end, not a silver bullet. There is no silver bullet when it comes to network security. Cryptography must be combined with other defense measures to create a robust solution for your site, one that provides defense in depth. Authentication and Non-Repudiation In addition to the three core areas of security, two other security goals are critical relative to cryptography: authentication and non-repudiation.

If I encrypt a message using one scheme and try to decrypt the message using a different scheme, the decryption process will not yield the original plaintext message; it will yield garbage text. ■■ A cryptanalyst is a person who tries to find weaknesses in encryption schemes. These people often work for those hush-hush agencies that we are not allowed to talk about, such as NSA (which is rumored to stand for No Such Agency). A cryptanalyst will often figure out how to break a crypto scheme, and then the developer of the scheme will use that information to make it stronger.

Every three to five weeks they will download random text from the Internet, encrypt it, and send it back and forth in a series of messages. The encrypted messages will contain nothing of value, but the large number of encrypted messages will catch the CIA’s attention. Law enforcement will spend a great deal of time trying to unencrypt these messages and, with any luck, will ignore the hidden writing contained in the images sent routinely by email every week. The terrorists will use encryption to draw attention away from their true covert communication, data hidden in images by means of steganography.

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