Q. What is the PGP stand for?

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Q. PGP makes use of which cryptographic algorithm?

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Q. USENET is related to which of the following Public Key distribution schemes?

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Q. Which of the following public key distribution systems is most secure?

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Q. Which systems use a timestamp?

i) Public-Key Certificates
ii) Public announcements
iii) Publicly available directories
iv) Public-Key authority

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

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Q. Which system uses a trusted third party interface?

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

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Q. Extensions were added in which version?

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

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Q. Which of the following is not an element/field of the X.509 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. Certificates generated by X that are the certificates of other CAs are Reverse Certificates.

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

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Q. CRL stands for

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

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

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

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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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