Q. What is cipher-block chaining ?

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Q. What is not an encryption standard ?

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Q. Which of following is not a stream cipher?

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Q. What is a Hash Function ?

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Q. MD5 produces __ bits hash data.

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Q. SHA-1 produces __ bit of hash.

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Q. Which two of the following are authentication algorithms ?

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Q. What is role of Key Distribution Center ?

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Q. In domain structure what is Access-right equal to ?

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Q. What is meaning of right-set ?

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Q. What is Domain ?

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Q. What does access matrix represent ?

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Q. What are the three additional operations to change the contents of the access-matrix ?

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Q. Who can add new rights and remove some rights ?

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Q. What are the three copy rights ?

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Q. Which two rights allow a process to change the entries in a column ?

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Q. Which is an unsolvable problem in access-matrix ?

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Q. Which of the following objects require protection ?

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Q. What is ‘separation’ in security of Operating systems ?

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Q. Which of the following statements are correct?
i) Physical separation – in which process use different physical objects like separate printers
ii) Physical separation – in which process having different security requirement at different times
iii) Logical separation – In which users operate under illusion that no other processes exist
iv) Logical sepration – In which processes conceal their data and computations

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