Table of Contents

## Which algorithm that takes plaintext of any length and generates a digest 128 bits in length?

MD5 is prone to length extension attacks. **The MD5 message-digest algorithm is a cryptographically broken but still widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities.**

## What is block cipher algorithm that operates on 64-bit blocks and can have a key length from 32 to 448 bits?

Blowfish

## What is a block cipher algorithm that operates on a 64-bit blocks and can have a key length?

DES

## What is block cipher algorithm that operates on 64-bit?

**A Blowfish is a block cipher that operates on 64-bit (8-byte) blocks of data. It uses a variable size key, but typically, 128-bit (16-byte) keys are considered to be good for strong encryption. Blowfish can be used in the same modes as DES.**

## What algorithm outputs a 128-bit message digest regardless of the length of the input?

Algorithm 5 (MD5)

## Which type of cryptographic algorithm takes an input string of any length and returns a string of any requested variable length?

**block cipher. block cipher manipulates an entire block of plaintext at one time. A sponge function takes as input a string of any length, and returns a string of any requested variable length. .**

## Which algorithms are used to generate message digests?

**Q and S i.e SHA 1 and MD5 are used to generate a message digest by the network security protocols.**

## Which cryptography attempts to use the microscopic behaviors of objects to develop and share keys while also detecting eavesdropping?

A. **Fundamentals Quantum cryptography takes advantage of the unique and unusual behavior of microscopic objects to enable users to securely develop secret keys as well as to detect eavesdropping.**

## What is a block cipher algorithm that operates on 64-bit blocks and can have a key length from 32 to 448?

DES

## What is a block cipher algorithm that operates?

**Blowfish is a symmetric block cipher. It uses a variable-length key ranging from 32 to 448 bits. Blowfish was designed in 1993 by Bruce Schneier.**

## What is 64-bit block?

**Blowfish is a symmetric block cipher. It uses a variable-length key ranging from 32 to 448 bits. Blowfish was designed in 1993 by Bruce Schneier.**

## Which encryption algorithm uses block cipher with the 16 bytes data block?

**Blowfish is a symmetric block cipher. It uses a variable-length key ranging from 32 to 448 bits. Blowfish was designed in 1993 by Bruce Schneier.**

## Which block cipher is based on Rijndael algorithm?

What is the block cipher algorithm that operates on 64-bit blocks and can have a key length from 32 to 448 bits known as? A **hash algorithm is designed to create a hash that represents the contents of a set of data that can later be decrypted.**

## Which algorithm has a message digest of 160 bits?

Secure Hash Algorithm

## What algorithm outputs a 160-bit key with variable length input?

**HAVAL (Hash of Variable Length) is a hash algorithm that creates message digests of 128, 160, 192, 224, or 256 bits in length, using 3, 4, or 5 rounds.**

## What is the output of SHA 1024 algorithm?

512-bits

## What is the output bit value of SHA-512 algorithm?

512 bits

## Which function in cryptography takes a string of any length as input and returns a string?

Practical applications include message integrity checks, digital signatures, authentication, and various information security applications. **A hash function takes a string of any length as input and produces a fixed length string which acts as a kind of signature for the data provided.**

## Which cryptographic algorithm is considered to be one way in that its contents can’t be used to reveal the original set of data?

**Hash Functions** Hashing only supports integrity and not confidentiality services. A hash function is a one-way cryptographic algorithm. The use of a one-way cryptographic algorithm means that the ciphertext cannot be decrypted to reveal the original plaintext.

## What type of cryptographic algorithm creates a unique Digitalfingerprint of a set of data?

MD5 is prone to length extension attacks. **The MD5 message-digest algorithm is a cryptographically broken but still widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities.**

## Which of the following is a message digest algo?

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.**

## How is message digest generated?

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.**

## How does Message Digest algorithm work?

Message digest algorithms rely on **cryptographic hash functions to generate a unique value that is computed from data and a unique symmetric key. A cryptographic hash function inputs data of arbitrary length and produces a unique value of a fixed length.**

## What type of cryptography uses two keys instead of just one generating both a private and a public key?

**Hash Functions** Hashing only supports integrity and not confidentiality services. A hash function is a one-way cryptographic algorithm. The use of a one-way cryptographic algorithm means that the ciphertext cannot be decrypted to reveal the original plaintext.

## What is a block cipher algorithm that operates on a 64-bit?

**International data encryption algorithm (IDEA) is a block cipher method similar to DES. It operates on 64-bit blocks of plaintext and uses a 128-bit key. The algorithm can be implemented either in hardware or software. It is three times faster than DES and is considered superior to DES.**