Cryptography Teacher Interview Questions And Answers
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Enhance your Cryptography Teacher interview preparation with our set of 55 carefully chosen questions. Each question is designed to test and expand your Cryptography Teacher expertise. Suitable for all experience levels, these questions will help you prepare thoroughly. Don't miss out on our free PDF download, containing all 55 questions to help you succeed in your Cryptography Teacher interview. It's an invaluable tool for reinforcing your knowledge and building confidence.
55 Cryptography Teacher Questions and Answers:
Cryptography Teacher Job Interview Questions Table of Contents:
1 :: 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.
Read MoreCryptography 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.
2 :: 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.
Read MoreSymmetric 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.
3 :: 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.
Read MoreAll 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.
4 :: 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.
Read MoreWe will see two aspects of the RSA cryptosystem, firstly generation of key pair and secondly encryption-decryption algorithms.
5 :: 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
Read MoreECC 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
6 :: 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}.
Read MoreExplanation: Perform the mix columns transformation to obtain the output {08 55 FF 3A}.
7 :: 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
Read More8 :: A substitution cipher substitutes one symbol with
Keys
Others
Multi Parties
Single Party
Others
Read More9 :: 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
Read More10 :: We use Cryptography term to transforming messages to make them secure and immune to
Change
Idle
Attacks
Defend
Attacks
Read More11 :: Man-in-the-middle attack can endanger security of Diffie-Hellman method if two parties are not
Authenticated
Joined
Submit
Separate
Authenticated
Read More12 :: 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
Read More13 :: 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)
Read More14 :: 1. How many computation rounds does the simplified AES consists of?
a) 5
b) 2
c) 8
d) 10
a) 5
Explanation: The simplified AES has only 2 rounds of computation.
Read MoreExplanation: The simplified AES has only 2 rounds of computation.
16 :: ElGamal encryption system is:
A. symmetric key encryption algorithm B. asymmetric key encryption algorithm C. not an encryption algorithm D. none of the mentioned
B. asymmetric key encryption algorithm
Read More17 :: On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function?
a) f function
b) permutation p
c) swapping of halves
d) xor of subkey with function f
c) swapping of halves
Explanation: There is no equivalent to swapping of halves in the AES algorithm.
Read MoreExplanation: There is no equivalent to swapping of halves in the AES algorithm.
18 :: Cryptanalysis is used:
A. to find some insecurity in a cryptographic scheme B. to increase the speed C. to encrypt the data D. none of the mentioned
A. to find some insecurity in a cryptographic scheme
Read More19 :: For the case of Mixed Columns and Inverse Mixed Columns, is it true that b(x) = a-1(x)mod(x4 + 1)
where a(x) = {03}x3 + {01}x2 + {01}x + {02} and b(x) = {0B}x3 + {0D}x2 + {09}x + {0E}
a) True
b) False. The expression for a(x) is wrong.
c) False. The expression for b(x) is wrong.
d) False. Both a(x) and b(x) are faulty.
a) True
Explanation: The statment is true and can be checked as it is similar to the matrix forms of mixed columns and inverse mixed columns.
Read MoreExplanation: The statment is true and can be checked as it is similar to the matrix forms of mixed columns and inverse mixed columns.
20 :: On perform the Mix Columns transformation for the sequence of bytes “67 89 AB CD” we get output
a) {08 55 FF 18}
b) {28 45 EF 08}
c) {28 45 FF 18}
d) {25 35 EF 08}
b) {28 45 EF 08}
Explanation: Perform the mix columns transformation to obtain the output {28 45 EF 0A}.
Read MoreExplanation: Perform the mix columns transformation to obtain the output {28 45 EF 0A}.
21 :: 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.
Read MoreExplanation: The block size for the AES algorithm is 16 bits.
22 :: A straight permutation cipher or a straight P-box has same number of inputs as
cipher
Frames
Outputs
Bits
Outputs
Read More23 :: Voice privacy in GSM cellular telephone protocol is provided by:
A. A5/2 cipher B. b5/4 cipher C. b5/6 cipher D. b5/8 cipher
A. A5/2 cipher
Read More24 :: In cryptography, what is cipher?
A. algorithm for performing encryption and decryption B. encrypted message C. both (a) and (b) D. none of the mentioned
A. algorithm for performing encryption and decryption
Read More25 :: Which of the following is a faulty S-AES step function?
a) Add round key
b) Byte substitution
c) Shift rows
d) Mix Columns
b) Byte substitution
Explanation: The correct version in S-AES would be nibble substitution as 4 bits are taken at a time.
Read MoreExplanation: The correct version in S-AES would be nibble substitution as 4 bits are taken at a time.