A cryptographic hash function has variable output length.

1.True

2.False

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

CDMA rejects

1.Narrow band interference

2.Wide band interference

3.Narrow & Wide band interference

4. None of the mentioned

CDMA uses

1.Hard hand off

2.Soft hand off

3.Hard & Soft hand off

4.None of the mentioned

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

Data compression includes

1.Removal of redundant character

2.Uniform distribution of characters

3.Removal of redundant character & Uniform distribution of characters

4.None of the mentioned

Encryption transformations are known as

1.Diffusion

2.Confusion

3.Diffusion & Confusion

4.None of the mentioned

Eulerâ€™s totient function is determined by

1.pq

2.(p-1)(q-1)

3.(p+1)(q+1)

4.p/q

Examples of hash functions are

1.MD5

2.SHA-1

3.MD5 & SHA-1

4. None of the mentioned

For digital signatures private key cryptosystem is used.

1.True

2.False

For n input bits the number of substitution patterns are

1.2n

2.(2n)!

3.1/2n!

4. 2n!

Frequency planning is very essential in

1.FDMA

2.TDMA

3.FDMA & TDMA

4.None of the mentioned

In a trapdoor function, the functions are easy to go in

1.One direction

2.Two directions

3.All directions

4.None of the mentioned

In cipher feedback method, encryption is done on

1.Single individual bits

2. Characters

3.Single individual bits & Characters

4.None of the mentioned

In digital communication, interaction between ______ is possible.

1.Any layer to layer

2.One layer to next layer

3. layers

4.None of the mentioned

In public key cryptosystem which is kept as public?

1.Encryption keys

2.Decryption keys

3.Encryption & Decryption keys

4.None of the mentioned

In public key cryptosystem _____ keys are used for encryption and decryption.

1.Same

2.Different

3.Encryption Keys

4.None of the mentioned

In stream encryption, the key sequence repeats itself.

1.True

2.False

In this Merkle Hellman method same key is used for encryption and decryption.

1.True

2.False

In transposition, the plaintext letters are

1.Substituted

2.Rearranged

3.Removed

4.None of the mentioned

In which method, key-stream is generated independently?

1.Synchronous

2.Self synchronous

3.Synchronous & Self synchronous

4.None of the mentioned

Knapsack problem can be solved by

1.Public key cryptosystem

2.Private key cryptosystem

3. Public & Private key cryptosystem

4.None of the mentioned

Merkle hellman is a symmetric cryptosystem.

1.True

2.False

PGP offers _____ block ciphers for message encryption.

1.Triple-DES

2.CAST

3.IDEA

4.All of the mentioned

PGP system uses

1.Private key system

2.Public key system

3.Private & Public key system

4.None of the mentioned

Pretty good privacy (PGP) security system uses

1.Public key cryptosystem

2.Private key cryptosystem

3.Public & Private key cryptosystem

4.None of the mentioned

Pretty good privacy program is used for

1.Electronic mails

2.File encryption

3.Electronic mails & File encryption

4.None of the mentioned

Private key algorithm is used for _____ encryption and public key algorithm is used for _____ encryption.

1.Messages, session key

2.Session key, messages

3.Can be used for both

4.None of the mentioned

Processing gain is the ratio of message bandwidth to signal bandwidth.

1.True

2.False

Public key cryptosystem is also known as

1.One way function

2.Two way function

3.Feedback function

4.None of the mentioned

Public key cryptosystem is used for the encryption of

1.Messages

2. Session key

3. Session key & Messages

4.None of the mentioned

Public key cryptosystem uses same key for both encryption and decryption.

1.True

2.False

Some advantages of spread spectrum are

1.Low susceptibility

2.Immunity to jamming

3.Reduced interference

4.All of the mentioned

Synchronous ciphers uses

1.Confusion

2.Diffusion

3.Confusion & Diffusion

4.None of the mentioned

The key size of DES is

1.56 bits

2.64 bits

3. 128 bits

4.168 bits

The substitution of the letters are done

1.Serially

2.Parallel way

3.Serially & Parallel way

4. None of the mentioned

These three ciphers can operate of ______ of plaintext and cipher text.

1.128 bit blocks

2.64 bit blocks

3.256 bit blocks

4.156 bit blocks

What is the key size allowed in PGP?

1.1024-1056

2.1024-4056

3.1024-4096

4. 1024-2048

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

Which algorithm is used for public key encryption?

1.RSA

2.Diffie-Hellman

3.RSA & Diffie-Hellman

4.None of the mentioned

Which are called the block ciphers?

1.IDEA

2.CAST

3.Triple-DES

4.All of the mentioned

Which block cipher has key length of 128 bits?

1.IDEA

2.CAST

3.IDEA & CAST

4.None of the mentioned

Which has a key length of 128 bits?

1.IDEA

2.Triple-DES

3.IDEA & Triple-DES

4.None of the mentioned

Which is better for avoiding jamming?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Which is more bandwidth efficient?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Which is more simpler to implement?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Which is more suitable when large number of transmitters are used?

1.Synchronous CDMA

2.Asynchronous CDMA

3.Synchronous & Asynchronous CDMA

4.None of the mentioned

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

Which should be kept as a secret in public key cryptosystem?

1.Encryption key

2.Decryption key

3.Encryption & Decryption key

4.None of the mentioned

Which uses orthogonal codes?

1.Synchronous CDMA

2.Asynchronous CDMA

3.Synchronous & Asynchronous CDMA

4.None of the mentioned

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