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Secure Audio Path
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The Secure Audio Path Model attempts to control the flow of copyrighted, unencrypted audio within Windows. The problem is that anyone can write a simulated audio device driver that would just steal the decrypted content while the media playback software is sending it to the sound card. The Secure Audio Path ensures that the copyrighted audio remains in the kernel and is only transmitted to audio drivers that were signed by a trusted authority.
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Watermarking
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Watermarking is the process of adding an additional channel of imperceptible data alongside a visible stream of data. Think of an image or audio file. A watermark is an invisible (or inaudible in the case of audio) data stream that is
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hidden within the file. The means for extracting the information from the data is usually kept secret (actually, the very existence of the watermark is typically kept secret). The basic properties of a good watermarking scheme are:
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The watermark is difficult to remove. The problem is that once attackers locate a watermark it is always possible to eliminate it from the data (see Protecting Digital Media Content by Nasir Memon and Ping Wah Wong [Memon]). It contains as much information as possible. It is imperceptible; it does not affect the visible aspect of the data stream. It is difficult to detect. It is encrypted. it makes sense to encrypt watermarked data so that it is unreadable if discovered. It is robust the watermark must be able to survive transfers and modifications of the carrier signal such as compression, or other types of processing.
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Let s take a look at some of the applications of Watermarking:
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Enabling authors to embed identifying information in their intellectual property. Identifying the specific owner of an individual copy (for tracing the flow of illegal copies) by using a watermarked fingerprint. Identifying the original, unmodified data through a validation mark.
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Research has also been made on software watermarking, whereby a program s binary is modified in a way that doesn t affect its functionality but allows for a hidden data storage channel within the binary code (see A Functional Taxonomy for Software Watermarking by J. Nagra, C. Thomboroson, and C. Colberg [Nagra]). The applications are similar to those of conventional media content watermarks.
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Trusted Computing
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Trusted computing is a generic name that describes new secure platforms that are being designed by all major players in the industry. It is a combination of hardware and software changes that aim to make PCs tamper-proof. Again, the fundamental technology is cryptography. Trusted computing designs all include some form of secure cryptographic engine chip that maintains a systemspecific key pair. The system s private key is hidden within the cryptographic engine, and the public key is publicly available. When you purchase
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Piracy and Copy Protection
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copyrighted material, the vendor encrypts the data using your system s public key, which means that the data can only be used on your system. This model applies to any kind of data: software, media files it doesn t really matter. The data is secure because the trusted platform will ensure that the user will be unable to access the decrypted information at any time. Of course, preventing piracy is not the only application of trusted computing (in fact, some developers of trusted computing platforms aren t even mentioning this application, probably in an effort to gain public support). Trusted computing will allow you to encrypt all of your sensitive information and to only make that information available to trusted software that comes from a trusted vendor. This means that a virus or any kind of Trojan wouldn t be able to steal your information and send it somewhere else; the decryption key is safely stored inside the cryptographic engine which is inaccessible to the malicious program. Trusted computing is a two-edged sword. On one hand, it makes computer systems more secure because sensitive information is well protected. On the other hand, it gives software vendors far more control of your system. Think about file formats, for instance. Currently, it is impossible for software vendors to create a closed file format that other vendors won t be able to use. This means that competing products can often read each other s file format. All they have to do is reverse the file format and write code that reads such files or even creates them. With trusted computing, an application could encrypt all of its files using a hidden key that is stored inside the application. Because no one ever sees the application code in its unencrypted form, no one would be able to find the key and decrypt the files created by that specific application. That may be an advantage for software vendors, but it s certainly a disadvantage for end users. What about content protection and digital rights management A properly implemented trusted platform will make most protection technologies far more effective. That s because trusted platforms attempt to address the biggest weakness in every current copy protection scheme: the inability to hide decrypted information while it is being used. Even current hardware-based solutions for software copy protection such as dongles suffer from such problems nowadays because eventually decrypted code must be written to the main system memory, where it is vulnerable. Trusted platforms typically have a protected partition where programs can run securely, with their code and data being inaccessible to other programs. This can be implemented on several different levels such as having a trusted CPU (Intel s LeGrande Technology is a good example of processors that enforce memory access restrictions between processes), or having control of memory accesses at some other level at the hardware. Operating system cooperation is also a part of the equation, and when it comes to Windows, Microsoft has already announced the Next-Generation Secure Computing Base (NGSCB),
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