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Even audio or video streams in the Advanced Systems Format (ASF) are identified by their GUIDs. GUIDs are also inserted into documents from Microsoft Office programs, as these are regarded as objects as well.
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V1 GUIDs which contain a MAC address and time can be identified by the digit "1" in the first position of the third group of digits, for example, and rather than having a named entry point called "IUnknown", the preceding GUID is used, thus every component that provides an IUnknown entry point gives the same GUID, and every program that looks for an IUnknown interface in a component always uses that GUID to find the entry point, knowing that an application using that particular GUID must always consistently implement IUnknown in the same manner and the same way. Most of the other digits are based on the time while generating the GUID. This privacy hole was used when locating the creator of the Melissa worm]. In these (V1) GUIDs, the user's network card MAC address is used as a base for the last group of GUID digits, which means, for example, that a document can be tracked back to the computer that created it. The OSF-specified algorithm for generating new GUIDs has been widely criticized. For instance:ħQDBkvCA1+B9K/U0vrQx1A 7QDBkvCA1+B9K/U0vrQx1A= Algorithm When printing fewer characters is desired, GUIDs are sometimes encoded into a base64 string of 22 to 24 characters (depending on padding). Often braces are added to enclose the above format, as such: Note that the digit order of the fourth field may be unexpected, since it's treated differently than in the structure. The last two fields are treated as eight separate bytes, each having their most significant digit on the left, and they follow each other from left to right. This text notation contains the following fields, separated by hyphens:įor the first three fields, the most significant digit is on the left. Guids are most commonly written in text as a sequence of hexadecimal digits such as: The most significant four bits of Data3 define the version number, and hence the algorithm used. Microsoft Component Object Model backward compatibility this includes the GUID's for important interfaces like IUnknown and IDispatch. Network Computing System backward compatibility One to three of the most significant bits of the second byte in Data 4 define the type variant of the GUID:
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The most significant byte in every field is stored last the last 8 bytes are stored consecutively.
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The most commonly used structure of the data type is: The GUID is also the basis of the GUID Partition Table, Intel's replacement for Master Boot Records under EFI.
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The term GUID usually refers to Microsoft's implementation of the Universally Unique Identifier (UUID) standard however, many other pieces of software use the term GUID including Oracle Database, dBase, OpenView Operations, and Novell eDirectory. For example, considering the observable universe contains about 5 × 10 22 stars, every star could have a GUID (though there would still be a collision due to the birthday paradox). While each generated GUID is not guaranteed to be unique, the total number of unique keys (2 128 or 3.4×10 38 is so large that the probability of the same number being generated twice is very small. A globally unique identifier ( GUID) is a special type of identifier used in software applications in order to provide a reference number which is unique in any context (hence, "Globally"), for example, in defining the internal reference for a type of access point in a software application, or for creating unique keys in a database.