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- Q5001215 subject Q6121277.
- Q5001215 abstract "Bus encryption is the use of encrypted program instructions on a data bus in a computer that includes a secure cryptoprocessor for executing the encrypted instructions. Bus encryption is used primarily in electronic systems that require high security, such as automated teller machines, TV set-top boxes, and secure data communication devices such as two-way digital radios.Bus encryption can also mean encrypted data transmission on a data bus from one processor to another processor. For example, from the CPU to a GPU which does not require input of encrypted instructions. Such bus encryption is used by Windows Vista and newer Microsoft operating systems to protect certificates, BIOS, passwords, and program authenticity. PVP-UAB (Protected Video Path) provides bus encryption of premium video content in PCs as it passes over the PCIe bus to graphics cards to enforce Digital rights management.The need for bus encryption arises when multiple people have access to the internal circuitry of an electronic system, either because they service and repair such systems, stock spare components for the systems, own the system, steal the system, or find a lost or abandoned system. Bus encryption is necessary not only to prevent tampering of encrypted instructions that may be easily discovered on a data bus or during data transmission, but also to prevent discovery of decrypted instructions that may reveal security weaknesses that an intruder can exploit.In TV set-top boxes, it is necessary to download program instructions periodically to customer's units to provide new features and to fix bugs. These new instructions are encrypted before transmission, but must also remain secure on data buses and during execution to prevent the manufacture of unauthorized cable TV boxes. This can be accomplished by secure crypto-processors that read encrypted instructions on the data bus from external data memory, decrypt the instructions in the cryptoprocessor, and execute the instructions in the same cryptoprocessor.".
- Q5001215 wikiPageExternalLink D469.PDF.
- Q5001215 wikiPageExternalLink nph-Parser?patentnumber=4278837.
- Q5001215 wikiPageWikiLink Q11230.
- Q5001215 wikiPageWikiLink Q141090.
- Q5001215 wikiPageWikiLink Q15738686.
- Q5001215 wikiPageWikiLink Q178048.
- Q5001215 wikiPageWikiLink Q192532.
- Q5001215 wikiPageWikiLink Q3698833.
- Q5001215 wikiPageWikiLink Q6121277.
- Q5001215 wikiPageWikiLink Q81235.
- Q5001215 wikiPageWikiLink Q842729.
- Q5001215 comment "Bus encryption is the use of encrypted program instructions on a data bus in a computer that includes a secure cryptoprocessor for executing the encrypted instructions. Bus encryption is used primarily in electronic systems that require high security, such as automated teller machines, TV set-top boxes, and secure data communication devices such as two-way digital radios.Bus encryption can also mean encrypted data transmission on a data bus from one processor to another processor.".
- Q5001215 label "Bus encryption".