hash value is a digital fingerprint of the data that is derived through a mathematical formula, or hash function,).  The product ID is unique to the installation of Windows and is created from the product key used during installation.  Each product key delivered with retail boxed software is unique, and the product ID it creates is unique.  Microsoft uses the product ID for product activation.  The product ID can be found by viewing the Properties of My Computer (an example of a product ID is 12345-123-1234567-12345).

 

The short hardware hash value is an eight byte value that is created by running 10 different pieces of information from the PC’s hardware components through a one-way mathematical transformation This means that the resultant hash value cannot be backwards calculated to determine the original values. Further, only a portion of the resulting hash value is used in the hardware hash in order to ensure complete anonymity. westsafe.net

 

Example:  A processor serial number is 96 bits in length.  When hashed, the resultant one-way hash is 128 bits in length.  Microsoft uses only six bits from that resultant hash in activation’s hardware hash.  Due to the nature of the hashing algorithm, those six bits cannot be backwards calculated to determine anything at all about the original processor serial number.

 

Moreover, six bits represent 64 (2^6) different values.  There were over 100 million PCs sold last year worldwide.  From those 100 million PCs sold, only 64 different hardware hash values could be created as part of activation.

  westsafe.net

Microsoft developed the hardware hash in this way in order to maintain the user’s privacy.

 

Additionally, whether or not the PC can be put into a docking station or accepts PCMCIA cards is also determined (the possibility of a docking station or PCMCIA cards existing means that hardware may disappear or seem changed when those devices are not present). Finally, the hardware hash algorithm has a version number. Together with the general nature of the other values used, two different PCs could actually create the same hardware hash.  The 10 different hardware values used to create the hash are outlined in the table below:

 

西部网安

Table 1: Hardware hash component values (phone activation)

西部网安 Component Name westsafe.net	Example Hash 西部网安 Value (#of bits) 你复制的文字来自西部网安
BIOS ID	000000 (6)
RemovablePolicy (One bit per component; Network Card, CD-ROM, Audio, SCSI, and IDE Adapter) 西部网安	11111 (5)
Network Adapter MAC Address 共7页: 上一页 [1] [2] 3 [4] [5] [6] [7] 下一页

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