17th
Jun

# Cryptography MCQ

• 17th Jun, 2022
• 546 Followers

## Cryptography MCQ

Following are mostly asked Cryptography MCQ test that are designed for professionals like you to crack you interviews. You can take this Cryptography online test before appearing to you real interview. This Cryptography quiz there are around 30+ multiple choice questions on Cryptography with four options.

### 1) What is Cryptography?

• A. Study Communications
• B. Secure Communications
• C. Both A and B
• D. None Of Above

### 2) Types of cryptography are

• A. Symmetric key Cryptography
• B. Asymmetric key Cryptography
• C. Public key Cryptography
• D. All of the Above

### 3) What are the main types of cryptographic algorithms?

• A. Hash functions
• B. Symmetric-key algorithms
• C. Asymmetric-key algorithms
• D. All of the Above

### 4) Who started cryptography?

• A. Spartans
• B. Julius Caesar
• C. Khnumhotep
• D. All of the Above

• A. 1 Key
• B. 2 Key
• C. 3 Key
• D. 4 Key

• A. Change
• B. Idle
• C. Attacks
• D. Todefend

### 7) DES stands for _____

• A. Data Encryption Slots
• B. Data Encryption Solutions
• C. Data Encryption Standard
• D. Data Encryption Subscription

### 8) The heart of Data Encryption Standard is

• A. Cipher
• B. Rounds
• C. Encryption
• D. DES function

### 9) In asymmetric key cryptography, the private key is kept by ______

• A. Sender
• D. None Of Above

### 10) In asymmetric key cryptography, the private key is kept by ______

• A. Sender
• D. None Of Above

• A. IBM
• B. Sony
• C. HP
• D. Intel

### 12) Cryptography, a word with Greek origins, means

• A. open writing
• B. secret writing
• C. closed writing
• D. corrupting data

### 13) ECB stands for ______

• A. Electronic Control Book
• B. Electronic Code Book
• C. Electronic Cipher Book
• D. Electronic Cryptography Book

### 14) The keys used in cryptography are

• A. public key
• B. secret key
• C. private key
• D. All of the Above

### 15) RSA stands for

• D. Robert, Shamir, Anthoney

### 16) Which one is not a RC5 operation?

• A. RC5 block cipher
• C. RC5-CipherText Stealing
• D. RC5-Cipher Block Chaining

### 17) OSI model is ______

• A. Open System internet
• B. Open Software internet
• C. Open System interconnections
• D. Open Software interconnections

### 18) Full Form of MALWARE is _______

• A. Multipurpose Software
• B. Malicious Software
• C. Malfunctioned Software
• D. None Of Above

• A. Virus
• B. Trojan
• C. Worm
• D. Antivirus

### 20) Which of the following techniques in symmetric key cryptography?

• A. Data encryption standard (des)
• B. Playfair cipher
• C. Diffie hellman cipher
• D. Both a & b

## Cryptography Online Test Questions (Cryptography FAQs)

### 1) What is cryptography?

Cryptography is the science of encoding and decoding information in a way that makes it unreadable to anyone except the sender and the receiver.

Cryptography, which is often referred to as "the art of secret writing," is a method for storing and communicating information in a way that prevents eavesdroppers from understanding it. The information may be encoded into unreadable text or scrambled into an unrecognizable form or both. In order to decode the message, one must know how it was encoded or encrypted.

### 2) What are the many types of cryptography techniques?

Cryptography is the process of encoding messages to keep them secret. It is a technique for protecting information by converting it into a form that is unreadable to anyone except those who have the decoding key.

There are many different cryptography techniques, but some of the most popular ones are:

• Symmetric Key Cryptography: This type of cryptography uses a single key to encrypt and decrypt data.
• Asymmetric Key Cryptography: This type of cryptography uses two keys, one public and one private, to encrypt and decrypt data.
• Hash Functions: These are mathematical functions that take an input string (message) and produce an output string (hash).

A hash function has two inputs; the message and a random number called the "seed". The seed can be anything from letters in the alphabet to numbers in a sequence. The hash function will always produce the same output given the same input, but it will never produce the same output given different inputs.

### 3) What are the differences between Public Key Cryptography and Secret Key Cryptography?

Secret Key Cryptography was one of the first cryptography systems developed. It is a symmetric-key algorithm, where the sender and receiver share the same key which is used to encrypt and decrypt messages. Public Key Cryptography is a two-key system where each user has their own public and private key.

In public key cryptography, the sender uses their private key to encrypt data they wish to send while in secret key cryptography, the sender uses their shared secret key to encrypt data they wish to send.

### 4) How many types of elements in Cryptography tool

A cryptography tool should have three basic components: encryption, decryption, and a key.

• Encryption is the process of converting information into a code that cannot be read by anyone who does not possess the key.
• Decryption is the process of converting encrypted information back into its original form using a key.
• A key is a piece of information that allows someone to decrypt encrypted messages or files without having to know how encryption was performed in the first place.

### 5) What is Quantum Cryptography?

Quantum cryptography is a new form of encryption that relies on the laws of quantum physics to guarantee security. Unlike traditional cryptography, which uses mathematical algorithms to encrypt information, quantum cryptography relies on the physical properties of quantum particles.

The basic idea behind this type of encryption is that if an eavesdropper tries to intercept and read a message, then they will change it in some way. The sender and receiver can detect this because they share a secret key that allows them to compare the original message with the one that was sent.

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