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The Internet's public character mandates the need for confidential communications in respect to users' right to privacy. Cryptography may not always suffice on its own, as a user can be forced to surrender the key upon discovery of an encrypted message. For that matter, covert channels offer the ability to communicate information in a clandestine way so as to avoid raising any suspicions. At the same time, more than 50% of the Internet's traffic is attributed to the World Wide Web, which presents an excellent environment for piggybacking covert messages. Empirical observations suggest that URLs are getting longer and more complicated, increasing in depth and the number of parameters they carry.
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