# which is a message digest algorithm mcq? ## Which of the following is a message digest algorithm Mcq?

3) Which of the following are used to create a message digest by the network security protocols? Explanation: RSA: Basically, it is an algorithm used to encrypt and decrypt messages.

## Which is a message digest algorithm?

Message Digest Algorithm 5 (MD5) is a cryptographic hash algorithm that can be used to create a 128-bit string value from an arbitrary length string. Although there has been insecurities identified with MD5, it is still widely used. MD5 is most commonly used to verify the integrity of files.

## What is Message Digest algorithm in cryptography?

A message digest algorithm or a hash function, is a procedure that maps input data of an arbitrary length to an output of fixed length. Output is often known as hash values, hash codes, hash sums, checksums, message digest, digital fingerprint or simply hashes.

## Which of the following is the strong attack mechanism?

A message digest algorithm or a hash function, is a procedure that maps input data of an arbitrary length to an output of fixed length. Output is often known as hash values, hash codes, hash sums, checksums, message digest, digital fingerprint or simply hashes.

## What is hash function Mcq?

MCQ – Hashing Function in Data Structure. … Explanation: In a hash table, there are fewer array positions than the keys, so the position of the key in the array has to be computed, this is done using the hash function.

## Which of the following is a hash function?

Answer: All of the given options such as MD5, Triple DES, and SHA-1 are examples of hash functions. These are cryptographic in nature and therefore suitable for cryptography.

## What is message digest with example?

A message digest is a cryptographic hash function containing a string of digits created by a one-way hashing formula. Message digests are designed to protect the integrity of a piece of data or media to detect changes and alterations to any part of a message.

## What is a message digest quizlet?

Terms in this set (12) message digest, hash, algorithm. takes a string of text (the contents of your file or messages) and produces a fixed-length set of hexadecimal characters.

## Why message digest MD is used?

MD5 digests have been widely used in the software world to provide some assurance that a transferred file has arrived intact. For example, file servers often provide a pre-computed MD5 (known as md5sum) checksum for the files, so that a user can compare the checksum of the downloaded file to it.

## What is digest algorithm sha256?

The SHA-256 algorithm is one flavor of SHA-2 (Secure Hash Algorithm 2), which was created by the National Security Agency in 2001 as a successor to SHA-1. SHA-256 is a patented cryptographic hash function that outputs a value that is 256 bits long.

## Is a message digest algorithm o DES o Idea o MD5 O encryption?

DES – Data Encryption Standard, or DES is a symmetric key algorithm for encryption of electronic data. MD5 – Message Digest 5, or MD5 is a widely used cryptographic hash function that produces a 128 bit hash value (message digest).

## What is message digest in Java?

Message digests are secure one-way hash functions that take arbitrary-sized data and output a fixed-length hash value. A MessageDigest object starts out initialized. The data is processed through it using the update methods. At any point reset can be called to reset the digest.

## Which one of the following is passive attack Mcq?

Examples of passive attacks include network analysis, eavesdropping and traffic analysis.

## Which operation provides diffusion Mcq?

Explanation: Non-linear mapping provides diffusion.

## Which of the following is a passive attack Mcq?

Explanation: In a passive attack, the attacker does not modify any part of the data. His attempt is only to obtain the information and not to modify it. From the mentioned options, this happens only in Traffic analysis in which the attacker monitors the pattern of transmission.

## What is firewall Mcq?

What is a firewall? Firewalls are network-based security measures that control the flow of incoming and outgoing traffic. A firewall is a program that encrypts all the programs that access the Internet.

## What is hash table MCQs?

This set of Data Structure Multiple Choice Questions &amp, Answers (MCQs) focuses on “Hash Tables”. … Explanation: A hash table is used to implement associative arrays which has a key-value pair, so the has table maps keys to values.

## What is extendible hashing Mcq?

This set of RDBMS Multiple Choice Questions &amp, Answers (MCQs) focuses on “Dynamic Hashing”. … Explanation: Dynamic hashing is also called as extendable hashing because it can accommodate the growth and shrinkage of the database.

## Which one of the following is a hashing algorithm?

Some common hashing algorithms include MD5, SHA-1, SHA-2, NTLM, and LANMAN. MD5: This is the fifth version of the Message Digest algorithm. MD5 creates 128-bit outputs. MD5 was a very commonly used hashing algorithm.

## What is hash based algorithm?

A hash algorithm is a function that converts a data string into a numeric string output of fixed length. … Hash algorithms are designed to be collision-resistant, meaning that there is a very low probability that the same string would be created for different data.

## What is hash function algorithm?

A hashing algorithm is a cryptographic hash function. It is a mathematical algorithm that maps data of arbitrary size to a hash of a fixed size. A hash function algorithm is designed to be a one-way function, infeasible to invert. … Every change to a message, even the smallest one, should change the hash value.

## What is message digest Tutorialspoint?

Message Digest (MD)

It is a 128-bit hash function. MD5 digests have been widely used in the software world to provide assurance about integrity of transferred file. For example, file servers often provide a pre-computed MD5 checksum for the files, so that a user can compare the checksum of the downloaded file to it.

## What is digest algorithm sha1?

SHA-1 or Secure Hash Algorithm 1 is a cryptographic hash function which takes an input and produces a 160-bit (20-byte) hash value. This hash value is known as a message digest. This message digest is usually then rendered as a hexadecimal number which is 40 digits long.

## Where is message digest used?

Message Digest is used to ensure the integrity of a message transmitted over an insecure channel (where the content of the message can be changed). The message is passed through a Cryptographic hash function.

## How many bits does sha1 encryption use?

SHA-1

General
Certification FIPS PUB 180-4, CRYPTREC (Monitored)
Cipher detail
Digest sizes 160 bits
Block sizes 512 bits

## Which message digest is used as MD?

MD5 is the Message Digest algorithm 5, created by Ronald Rivest. It is the most widely used of the MD family of hash algorithms.

## What is message digest in network security?

A message digest is a fixed size numeric representation of the contents of a message, computed by a hash function. A message digest can be encrypted, forming a digital signature. Messages are inherently variable in size. … It must be computationally infeasible to find two messages that hash to the same digest.

## What is message digest length?

As shown in Table 1, all four of the algorithms are iterative, one-way hash functions that can process a message with a maximum length of 264– to 2128-bits to produce a 160- to 512-bit condensed representation called a message digest. The input message is processed in 512- to 1,024-bit blocks.

## What does 256 mean in SHA256?

SHA-256 stands for Secure Hash Algorithm 256-bit and it’s used for cryptographic security. Cryptographic hash algorithms produce irreversible and unique hashes.

## What is SHA256 in Blockchain?

What Is SHA-256? Secure Hashing Algorithm (SHA) -256 is the hash function and mining algorithm of the Bitcoin protocol, referring to the cryptographic hash function that outputs a 256 bits long value. It moderates the creation and management of addresses, and is also used for transaction verification.

## How do you write SHA256 algorithm?

Step-by-step SHA-256 hash of “hello world”

1. Step 1 – Pre-Processing. Convert “hello world” to binary: …
2. Step 2 – Initialize Hash Values (h) Now we create 8 hash values. …
3. Step 3 – Initialize Round Constants (k) …
4. Step 4 – Chunk Loop. …
5. Step 5 – Create Message Schedule (w) …
6. Step 6 – Compression.

## Which type of function has been used to generate message digest from a given message such as how are you?

You can generate the message digest using the digest() method od the MessageDigest class this method computes the hash function on the current object and returns the message digest in the form of byte array.

## What is MD5 and SHA256?

Both MD5 and SHA256 are used as hashing algorithms. They take an input file and generate an output which can be of 256/128-bit size. This output represents a checksum or hash value. … MD5 result in an output of 128 bits whereas SHA256 result output of 256 bits.

## What is a Mac in cryptography?

What Is a Message Authentication Code? A message authentication code (MAC), or tag, is a security code that is typed in by the user of a computer to access accounts or portals. This code is attached to the message or request sent by the user.

## What is cryptography Mcq?

This set of Computer Networks Multiple Choice Questions &amp, Answers (MCQs) focuses on “Cryptography”. … Explanation: Cipher is a method to implement encryption and decryption of messages travelling in a network. It’s used to increase the confidentiality of the messages.

## Which one is a passive attack?

A passive attack on a cryptosystem is one in which the cryptanalyst cannot interact with any of the parties involved, attempting to break the system solely based upon observed data (i.e. the ciphertext). This can also include known plaintext attacks where both the plaintext and its corresponding ciphertext are known.

## Which of the following is the type of firewall Mcq?

Explanation: There are four types of firewall based on their working and characteristics. These are Packet Filtering Firewalls, Circuit Level Gateway Firewalls, Application level Gateway Firewalls, and Stateful Multilayer Inspection Firewalls.

## What is Data Encryption Standard algorithm?

The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST). The algorithm takes the plain text in 64-bit blocks and converts them into ciphertext using 48-bit keys.

## Which of the following operation is are used in DES algorithm?

Which one of the following modes of operation in DES is used for operating short data? Explanation: The Electronic code book mode is used for operating on short data as the same key is used for each block. Thus repetitions in Plain Text lead to repetitions in Cipher Text.

## Is a block cipher Mcq?

7. Confusion hides the relationship between the ciphertext and the plaintext. 8. The S-Box is used to provide confusion, as it is dependent on the unknown key.

Online Test.

1. In affine block cipher systems if f(m)=Am + t, what is f(m1+m2) ?
b. f(m1) + f(m2) + 2t
c. f(m1) + t
d. f(m1) + f(m2)

## Which one of the following is active attack?

The correct answer is (C) Modification attack. It is a type of active attack on computer software.

## Which of the following algorithm is associated with digital signature Mcq?

Explanation: A digital signature consists of three algorithms: Key generation algorithm, Signing algorithm and Signature verifying algorithm.

## Which one of the following algorithm is not used in asymmetric key cryptography?

Which one of the following algorithm is not used in asymmetric-key cryptography? Explanation: Electronic code book algorithm is a block cipher method in which each block of text in an encrypted message corresponds to a block of data. It is not feasible for block sizes smaller than 40 bits.