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As it is similar to the hackers’ configuration, it should provide a realistic assessment of the security of the TOE. Many people believe that black box evaluation is the solution of choice. Of course, hackers will use any possible means to collect related non-public information, for instance, using social engineering. Thus, black box testing mimics the configuration encountered by hackers.

Black box testing means that the security assessor has only access to the TOE and publicly available information.

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White box testing means that the security assessor has access to the entire documentation, the source code and even sometimes an instrumented target of evaluation (TOE). Nevertheless, recent discussions highlighted that it is not clear for everybody. White or Black: Which is the best choice? Is white box testing cheating? To me, the answers seem trivial. What would the system do if, from many locations, there is a beacon broadcasting the same public key? Will the collection of multiple related public keys not reveal some partial information, for instance one of the exponents? Posted in Products, Security, Technology | Leave a reply Security assessment: white or black box? It is complex, thus subject to failures and vulnerabilities.

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The frequency of key rotation, is there a limited number of public keys, how to know which hash to send? Waiting for some publications to deep dive.

Many questions that were not answered in the presentation. Normally, Apple can neither get the location nor link different related public keys together. Of course, under the assumption that Apple does not have the private key, only your devices can decrypt the location. The device has the private key and thus can decrypt the location. It sends the hash of the public key to the Apple server, which returns the encrypted location. If you want to locate one of your devices, you trigger the request on one of your devices. The cryptographic hash of the public key to Apple’s server. It sends the encrypted location as well as Then the receivingĭevice encrypts its current GPS location with the broadcast public key.

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The device broadcasts via Bluetooth its current public This is possible, and there are numerous known cryptographic solutions that may fulfill this part. The trick is that instead of having one unique public key, the devices have a multitude of public keys linked to this private key. The prerequisite is that you have at least two Apple devices. GPS location of your device if it is stolen or lost. Posted in Products, Security, Smartcard | Leave a reply Apple’s Find MyĪpple disclosed at the WWDC an interesting feature: “Find

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Current tamper-resistant software and obfuscation technologies may not be sufficient. TPM offers a valid HRoT but not a Secure Execution Environment. They will have to find an alternative that is not necessarily available.

Some applications were also basing their security model on SGX. For Microsoft Windows, the solution was the use of SGX. Indeed, the content protection standard AACS2 mandates a Secure Execution Environment with a Hardware Root of Trust (HRoT). Thus, it seems that in its current form, SGX cannot be a trusted secure enclave.įor most consumers, the main consequence is that future PCs will not support any more UHD Blu-ray. Unfortunately, starting with Spectre-like attacks, SGX was under the fire of many interesting exploits (for instance, VoltPillager). Thus SGX-based applications could act as a Root of Trust.Īt least, this was the promise. The SGX isolates the program and data in its environment from the insecure Rich Execution Environment (REE). Intel announced that the next generations of CPUs (11 th and 12 th) will no longer support the SGX technology (see data sheet).

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