You can do this by pressing the Windows key and typing device security. From there, click the Security processor details link. On the commercial laptop, the vendor HP, in this case has embedded an actual discrete Infineon TPM module into the laptop, a normal practice for corporate laptops. Which is better? Generally, the discrete or separate TPM module is believed to be better, as it supports more encryption algorithms.
With device heath attestation, you can configure an MDM server to query a health attestation service that will allow or deny a managed device access to a secure resource. Support for TPM 1. TPM 2. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. TPM internal data storage formats are thus limited by the maximum size of data that can be encrypted using an RSA operation of a particular key length.
But how does the TPM deal with false key injection - as the public half of the storage key will be available to all? The ability to insert false keys may seem irrelevant after all it cannot gain access to existing storage keys which govern protected content , but is crucial as without it, it would be possible to create a key which is designated as non-migrateable can never be removed from a specific TPM , and yet with a value known to the attacker.
If a content provider were to issue content to be protected under this key, a breach would occur. This ensures that false keys cannot be inserted into the key hierarchy: whilst anyone can of course encrypt plaintext under a public key, they do not have access to the clear value of TPM proof. Essentially, the asymmetric crypto system is converted into a symmetric one, with a composite key consisting of the private half of the root storage key and TPM proof.
The TPM does make extensive use of cryptographic hash operations, however, and currently uses the SHA-1 hash algorithm. This hash algorithm is used to "extend" the values in the Platform Configuration Registers PCRs , to detect and prevent data modification, identify keys, and to create "capabilities" used to improve the efficiency of command chaining.
Capabilities are created by hashing particular command parameters together with the secret value TPM Proof in order to create a bit capability string which cannot be forged by an adversary. This is useful in improving the performance of for example third-party approved migration, where the third-party produces an authorisation certificate processed by the TPM. The TPM architecture would be complicated by storing additional state between API commands, but on the other hand, requiring the migration certificate to be verified before the migration of every individual key incurs a performance penalty.
The use of capabilities based on TPM Proof allows the check to be done once only, and a capability issued, which is much quicker to check at subsequent invocations of migrate commands. Physical tamper-resistance is another area where the TPM architecture has been thought out carefully. In principle, there is no limit to the security of a system built when cost is not a factor.
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