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I feel this ebook can be priceless for individuals extra conversant in the subject.I was hoping to appreciate TPM command to encrypt/decrypt the data/key yet locate the booklet not easy to learn. There are a number of examples in C yet these are evasive and go away me with extra questions and doubt. I gave up after numerous chaptersTo be reasonable, i tried to learn TCG specifications (and there are so many!) besides and people have been both complicated to me and it truly is tough to fulfill all points of TPM. i've got extra knowing of TPM after examining a number of chapters yet my unique questions remained unanswered.
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Extra info for A Practical Guide to Trusted Computing
If you trust the BIOS corresponding to the recorded PCR value, then you can trust the extensions to the PCR made by the BIOS. If you trust the boot loader, then you can trust the PCR extensions made by the boot loader. In this way, the trust boundary extends from the root of trust all the way to the kernel of the operating system (or beyond). 1. Load Core BIOS Core BIOS Measures Core BIOS Core BIOS Measures Rest of BIOS Core BIOS Measures Motherboard Configuration Settings PCR 0: Core BIOS Rest of BIOS PCR 1: BIOS config PCR 2: ROM BIOS Load Rest of BIOS PCR 3: ROM config BIOS Measures ROM Firmware BIOS Measures ROM Firmware Config Load Firmware Control Returned to BIOS BIOS Measures IPL BIOS Measures IPL Config PCR 4: IPL code PCR 5: IPL code config Dark gray boxes represent a normal boot sequence.
If you lose a private key that is being used for authentication to your bank, you can always get a new TPM, create new keys, and register the new public keys with the bank. If, however, the TPM is being used to seal encryption keys, then failure of the TPM would lead to loss of all data encrypted under those keys. Clearly this is not acceptable. Fortunately, the TPM speciﬁcation explicitly provides the owner of a key the secure ability to move keys from one TPM and back to the same TPM (key backup and restore), or from one TPM to a different TPM (key migration).
Additionally, the TPM may require that certain PCR of the TPM contain speciﬁc values. ” We now have an even more complicated set of possibilities: a four-parameter set with each parameter able to take on two values—yes or no. This leads to 16 possibilities, not all of which are useful. The four parameters are as follows: • Is a PCR needed to load the key? • Is a PCR needed to use the key? • Is usage authorization information (a pass phrase) needed to load the key? • Is usage authorization information (a pass phrase) needed to use the key?