Question 11 : In stream encryption, the key sequence repeats itself.
1. True
2. False
3.
4.
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Question 12 : Which algorithm can be used to sign a message?
1. Public key algorithm
2. Private key algorithm
3. Public & Private key algorithm
4. None of the mentioned
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Question 13 : In public key cryptosystem _____ keys are used for encryption and decryption.
1. Same
2. Different
3. Encryption Keys
4. None of the mentioned
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Question 14 : A set of numbers is called as super increasing if
1. Each element is greater than previous element
2. Each element greater than sum of all the previous elements
3. Each element greater than the average of all elements
4. Each element lesser than the sum of all the elements
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Question 15 : DSA protocol is based on
1. Discrete logarithm problem
2. Continuous logarithm problem
3. Discrete & Continuous logarithm problem
4. None of the mentioned
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Question 16 : The hash function
1. Is collision free
2. Has manageable collision
3. Has high unmanageable level of collision
4. None of the mentioned
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Question 17 : Which should be used first to decrypt?
1. Public key
2. Private key
3. Public & Private key
4. None of the mentioned
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Question 18 : Which operation is used in encryption using IDEA?
1. Addition modulo 216
2. Bit wise XOR
3. Addition modulo 216 & Bit wise XOR
4. None of the mentioned
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Question 19 : The key size of DES is
1. 56 bits
2. 64 bits
3. 128 bits
4. 168 bits
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Question 20 : Cipher system can be solved effectively by statistically using
1. Time of occurrence
2. Frequency of occurrence
3. Length of the message
4. None of the mentioned
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