Q. How many functions are involved in the PKIX architectural model?

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Q. Certificate extensions fall into 3 categories. Which one of the following is not a Certificate extensions category?

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Q. The period of validity consists of the date on which the certificate expires.

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Q. The issuer unique identifier of the X.509 certificates was added in which version?

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Q. X.509 certificate recommends which cryptographic algorithm?

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Q. A total of seven messages are required in the Public-Key distribution scenario. However, the initial five messages need to be used only infrequently because both A and B can save the other’s public key for future – a technique known as ____

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Q. How many handshake rounds are required in the Public-Key Distribution Scenario?

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Q. “Conveys any desired X.500 directory attribute values for the subject of this certificate.”
Which Extension among the following does this refer to?

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Q. The criticality indicator indicates whether an extension can be safely ignored.

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Q. Which of the following is not a part of an Extension?

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Q. CRL stands for

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Q. It is desirable to revoke a certificate before it expires because

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Q. Certificates generated by X that are the certificates of other CAs are Reverse Certificates.

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Q. Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B’s public key. In notation of X.509, this chain is represented in the correct order as –

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Q. Which of the following is not an element/field of the X.509 certificates?

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Q. The subject unique identifier of the X.509 certificates was added in which version?

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Q. Extensions were added in which version?

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Q. Publicly Available directory is more secure than which other system?

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Q. Which system uses a trusted third party interface?

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Q. Which of these systems use timestamps as an expiration date?

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