Cryptography Teacher Questions And Answers

1⟩ Which one of the following is a cryptographic protocol used to secure HTTP connection? A. stream control transmission protocol (SCTP) B. transport layer security (TSL) C. explicit congestion notification (ECN) D. resource reservation protocol

B. transport layer security (TSL)

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2⟩ Man-in-the-middle attack can endanger security of Diffie-Hellman method if two parties are not Authenticated Joined Submit Separate

Authenticated

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3⟩ Cryptographic hash function takes an arbitrary block of data and returns A. fixed size bit string B. variable size bit string C. both (a) and (b) D. none of the mentioned

A. fixed size bit string

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4⟩ What is the block size in the Simplified AES algorithm? a) 8 bits b) 40 bits c) 16 bits d) 36 bits

b) 40 bits

Explanation: The block size for the AES algorithm is 16 bits.

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5⟩ In cryptography, the order of the letters in a message is rearranged by A. transpositional ciphers B. substitution ciphers C. both (a) and (b) D. none of the mentioned

A. transpositional ciphers

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6⟩ A substitution cipher substitutes one symbol with Keys Others Multi Parties Single Party

Others

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7⟩ We use Cryptography term to transforming messages to make them secure and immune to Change Idle Attacks Defend

Attacks

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8⟩ S-AES and S-DES were both developed by the same person as an educational cryptography system to teach students a) True b) False

a) True

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9⟩ On perform the Mix Columns transformation for the sequence of bytes “77 89 AB CD” we get output a) {01 55 EE 4A} b) {0A 44 EF 4A} c) {08 55 FF 3A} d) {09 44 DD 4A}

c) {08 55 FF 3A}

Explanation: Perform the mix columns transformation to obtain the output {08 55 FF 3A}.

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10⟩ What is Elliptic Curve Cryptography (ECC)?

Elliptic Curve Cryptography (ECC) is a term used to describe a suite of cryptographic tools and protocols whose security is based on special versions of the discrete logarithm problem. It does not use numbers modulo p.

ECC is based on sets of numbers that are associated with mathematical objects called elliptic curves. There are rules for adding and computing multiples of these numbers, just as there are for numbers modulo p.

ECC includes a variants of many cryptographic schemes that were initially designed for modular numbers such as ElGamal encryption and Digital Signature Algorithm.

It is believed that the discrete logarithm problem is much harder when applied to points on an elliptic curve. This prompts switching from numbers modulo p to points on an elliptic curve. Also an equivalent security level can be obtained with shorter keys if we use elliptic curve-based variants.

The shorter keys result in two benefits −

Ease of key management

Efficient computation

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11⟩ What is RSA Cryptosystem?

This cryptosystem is one the initial system. It remains most employed cryptosystem even today. The system was invented by three scholars Ron Rivest, Adi Shamir, and Len Adleman and hence, it is termed as RSA cryptosystem.

We will see two aspects of the RSA cryptosystem, firstly generation of key pair and secondly encryption-decryption algorithms.

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12⟩ Explain me Monoalphabetic and Polyalphabetic Cipher?

Monoalphabetic cipher is a substitution cipher in which for a given key, the cipher alphabet for each plain alphabet is fixed throughout the encryption process. For example, if ‘A’ is encrypted as ‘D’, for any number of occurrence in that plaintext, ‘A’ will always get encrypted to ‘D’.

All of the substitution ciphers we have discussed earlier in this chapter are monoalphabetic; these ciphers are highly susceptible to cryptanalysis.

Polyalphabetic Cipher is a substitution cipher in which the cipher alphabet for the plain alphabet may be different at different places during the encryption process. The next two examples, playfair and Vigenere Cipher are polyalphabetic ciphers.

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13⟩ Tell me what is Cryptography?

Cryptography is the art and science of making a cryptosystem that is capable of providing information security.

Cryptography deals with the actual securing of digital data. It refers to the design of mechanisms based on mathematical algorithms that provide fundamental information security services. You can think of cryptography as the establishment of a large toolkit containing different techniques in security applications.

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14⟩ Explain me types of Cryptosystems?

Fundamentally, there are two types of cryptosystems based on the manner in which encryption-decryption is carried out in the system −

Symmetric Key Encryption

Asymmetric Key Encryption

The main difference between these cryptosystems is the relationship between the encryption and the decryption key. Logically, in any cryptosystem, both the keys are closely associated. It is practically impossible to decrypt the ciphertext with the key that is unrelated to the encryption key.

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15⟩ Explain components of a Cryptosystem?

The various components of a basic cryptosystem are as follows −

Plaintext. It is the data to be protected during transmission.

Encryption Algorithm. It is a mathematical process that produces a ciphertext for any given plaintext and encryption key. It is a cryptographic algorithm that takes plaintext and an encryption key as input and produces a ciphertext.

Ciphertext. It is the scrambled version of the plaintext produced by the encryption algorithm using a specific the encryption key. The ciphertext is not guarded. It flows on public channel. It can be intercepted or compromised by anyone who has access to the communication channel.

Decryption Algorithm, It is a mathematical process, that produces a unique plaintext for any given ciphertext and decryption key. It is a cryptographic algorithm that takes a ciphertext and a decryption key as input, and outputs a plaintext. The decryption algorithm essentially reverses the encryption algorithm and is thus closely related to it.

Encryption Key. It is a value that is known to the sender. The sender inputs the encryption key into the encryption algorithm along with the plaintext in order to compute the ciphertext.

Decryption Key. It is a value that is known to the receiver. The decryption key is related to the encryption key, but is not always identical to it. The receiver inputs the decryption key into the decryption algorithm along with the ciphertext in order to compute the plaintext.

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16⟩ Which one of the following algorithm is not used in asymmetric-key cryptography? A. RSA algorithm B. diffie-hellman algorithm C. electronic code book algorithm D. none of the mentioned

C. electronic code book algorithm

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17⟩ What is the key size in the S-AES algorithm? a) 16 bits b) 32 bits c) 24 bits d) None of the mentioned

a) 16 bits

Explanation: The key size in the S-AES algorithm is 16 bits.

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18⟩ For the cipher text 0000 0111 0011 1000 and Key 0110 1111 0110 1011, apply the Simplified AES to obtain the plaintext. The plain text is a) 0110 1001 0111 0001 b) 0110 1111 0110 1011 c) 0010 1001 0110 1011 d) 1111 0101 0111 1111

b) 0110 1111 0110 1011

Explanation: On applying the simplified AES we would obtain 0110 1111 0110 1011 as the plain text.

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19⟩ What is data encryption standard (DES)? A. block cipher B. stream cipher C. bit cipher D. none of the mentioned

A. block cipher

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20⟩ In asymmetric key cryptography, the private key is kept by A. sender B. receiver C. sender and receiver D. all the connected devices to the network

B. receiver

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Cryptography Teacher

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55 Cryptography Teacher Questions And Answers

1⟩ Which one of the following is a cryptographic protocol used to secure HTTP connection? A. stream control transmission protocol (SCTP) B. transport layer security (TSL) C. explicit congestion notification (ECN) D. resource reservation protocol

2⟩ Man-in-the-middle attack can endanger security of Diffie-Hellman method if two parties are not Authenticated Joined Submit Separate

3⟩ Cryptographic hash function takes an arbitrary block of data and returns A. fixed size bit string B. variable size bit string C. both (a) and (b) D. none of the mentioned

4⟩ What is the block size in the Simplified AES algorithm? a) 8 bits b) 40 bits c) 16 bits d) 36 bits

5⟩ In cryptography, the order of the letters in a message is rearranged by A. transpositional ciphers B. substitution ciphers C. both (a) and (b) D. none of the mentioned

6⟩ A substitution cipher substitutes one symbol with Keys Others Multi Parties Single Party

7⟩ We use Cryptography term to transforming messages to make them secure and immune to Change Idle Attacks Defend

8⟩ S-AES and S-DES were both developed by the same person as an educational cryptography system to teach students a) True b) False

9⟩ On perform the Mix Columns transformation for the sequence of bytes “77 89 AB CD” we get output a) {01 55 EE 4A} b) {0A 44 EF 4A} c) {08 55 FF 3A} d) {09 44 DD 4A}

10⟩ What is Elliptic Curve Cryptography (ECC)?

11⟩ What is RSA Cryptosystem?

12⟩ Explain me Monoalphabetic and Polyalphabetic Cipher?

13⟩ Tell me what is Cryptography?

14⟩ Explain me types of Cryptosystems?

15⟩ Explain components of a Cryptosystem?

16⟩ Which one of the following algorithm is not used in asymmetric-key cryptography? A. RSA algorithm B. diffie-hellman algorithm C. electronic code book algorithm D. none of the mentioned

17⟩ What is the key size in the S-AES algorithm? a) 16 bits b) 32 bits c) 24 bits d) None of the mentioned

18⟩ For the cipher text 0000 0111 0011 1000 and Key 0110 1111 0110 1011, apply the Simplified AES to obtain the plaintext. The plain text is a) 0110 1001 0111 0001 b) 0110 1111 0110 1011 c) 0010 1001 0110 1011 d) 1111 0101 0111 1111

19⟩ What is data encryption standard (DES)? A. block cipher B. stream cipher C. bit cipher D. none of the mentioned

20⟩ In asymmetric key cryptography, the private key is kept by A. sender B. receiver C. sender and receiver D. all the connected devices to the network

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Cryptography Teacher

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55 Cryptography Teacher Questions And Answers

1⟩ Which one of the following is a cryptographic protocol used to secure HTTP connection? A. stream control transmission protocol (SCTP) B. transport layer security (TSL) C. explicit congestion notification (ECN) D. resource reservation protocol

2⟩ Man-in-the-middle attack can endanger security of Diffie-Hellman method if two parties are not Authenticated Joined Submit Separate

3⟩ Cryptographic hash function takes an arbitrary block of data and returns A. fixed size bit string B. variable size bit string C. both (a) and (b) D. none of the mentioned

4⟩ What is the block size in the Simplified AES algorithm? a) 8 bits b) 40 bits c) 16 bits d) 36 bits

5⟩ In cryptography, the order of the letters in a message is rearranged by A. transpositional ciphers B. substitution ciphers C. both (a) and (b) D. none of the mentioned

6⟩ A substitution cipher substitutes one symbol with Keys Others Multi Parties Single Party

7⟩ We use Cryptography term to transforming messages to make them secure and immune to Change Idle Attacks Defend

8⟩ S-AES and S-DES were both developed by the same person as an educational cryptography system to teach students a) True b) False

9⟩ On perform the Mix Columns transformation for the sequence of bytes “77 89 AB CD” we get output a) {01 55 EE 4A} b) {0A 44 EF 4A} c) {08 55 FF 3A} d) {09 44 DD 4A}

10⟩ What is Elliptic Curve Cryptography (ECC)?

11⟩ What is RSA Cryptosystem?

12⟩ Explain me Monoalphabetic and Polyalphabetic Cipher?

13⟩ Tell me what is Cryptography?

14⟩ Explain me types of Cryptosystems?

15⟩ Explain components of a Cryptosystem?

16⟩ Which one of the following algorithm is not used in asymmetric-key cryptography? A. RSA algorithm B. diffie-hellman algorithm C. electronic code book algorithm D. none of the mentioned

17⟩ What is the key size in the S-AES algorithm? a) 16 bits b) 32 bits c) 24 bits d) None of the mentioned

18⟩ For the cipher text 0000 0111 0011 1000 and Key 0110 1111 0110 1011, apply the Simplified AES to obtain the plaintext. The plain text is a) 0110 1001 0111 0001 b) 0110 1111 0110 1011 c) 0010 1001 0110 1011 d) 1111 0101 0111 1111

19⟩ What is data encryption standard (DES)? A. block cipher B. stream cipher C. bit cipher D. none of the mentioned

20⟩ In asymmetric key cryptography, the private key is kept by A. sender B. receiver C. sender and receiver D. all the connected devices to the network

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