A security architect is designing a system to satisfy user demand for reduced transaction time, increased security and message integrity, and improved cryptographic security. The resultant system will be used in an environment with a broad user base where many asynchronous transactions occur every minute and must be publicly verifiable.
Which of the following solutions BEST meets all of the architect’s objectives?
A. An internal key infrastructure that allows users to digitally sign transaction logs
B. An agreement with an entropy-as-a-service provider to increase the amount of randomness in generated keys.
C. A publicly verified hashing algorithm that allows revalidation of message integrity at a future date.
D. An open distributed transaction ledger that requires proof of work to append entries.
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Answer is A
A. An internal key infrastructure (Yes, this fulfills all requirements.)
B. entropy-as-a-service to increase randomness. (No, decentralized random generator for cloud and IoT. This can increase your cryptography strength, but you still need to come up with the cryptography infrastructure and ways to be verifiable.)
C. publicly hashing algorithm revalidation on future date. (No, what revalidate in future?)
D. open distributed transaction ledger. (No, just the sound of it is unsafe.)
A