Cryptography

Q1. This is an encryption/decryption key known only to the party or parties that exchange secret messages.

1.  e-signature
2.  digital certificate
3.  private key
4.  security token

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Q2. Cryptographic hash function takes an arbitrary block of data and returns

1.  fixed size bit string
2.  variable size bit string
3.  both (1) and (2)
4.  none of the mentioned

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Q3. The inverse of 37 mod 49 is

1.  23
2.  12
3.  4
4.  6

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Q4. This is a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa.

1. footprinting
2. hash function
3. watermark
4. Electronic Code Book

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Q5. How many primitive roots are there for 19?

1.  4
2.  5
3.  3
4.  6

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Q6. Voice privacy in GSM cellular telephone protocol is provided by

1.  A5/2 cipher
2.  b5/4 cipher
3.  b5/6 cipher
4.  b5/8 cipher

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Q7. In cryptography, the order of the letters in a message is rearranged by

1. transpositional ciphers
2. substitution ciphers
3. both (1) and (2)
4. none of the mentioned

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Q8. What is data encryption standard (DES)?

1. block cipher
2. stream cipher
3. bit cipher
4. none of the mentioned

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Q9. The cryptography algorithms used in S/MIME are _________.

1. IDEA.
2. RC4.
3. RSA,DES-3.
4. RC5.

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Q10. In asymmetric key cryptography, the private key is kept by

1. sender
2. receiver
3. sender and receiver
4. all the connected devices to the network

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