Which of the following is the definition of stream cipher?

Which of the following is the definition of stream cipher?

A stream cipher is a method of encryption where a pseudorandom cipher digit stream is combined with plain text digits. This pseudorandom cipher digit stream is applied to each binary digit, one bit at a time. This method of encryption uses an infinite number of pseudorandom cipher digits per key.

What is an example of a stream cipher?

ChaCha is becoming the most widely used stream cipher in software; others include: RC4, A5/1, A5/2, Chameleon, FISH, Helix, ISAAC, MUGI, Panama, Phelix, Pike, Salsa20, SEAL, SOBER, SOBER-128, and WAKE.

What is the idea of stream ciphers?

A stream cipher is an encryption algorithm that uses a symmetric key to encrypt and decrypt a given amount of data. A symmetric cipher key, as opposed to an asymmetric cipher key, is an encryption tool that is used in both encryption and decryption.

What is stream cipher in cryptography?

A stream cipher encrypts plaintext messages by applying an encryption algorithm with a pseudorandom cipher digit stream (keystream). Each bit of the message is encrypted one by one with the corresponding keystream digit. Stream ciphers are typically used in cases where speed and simplicity are both requirements.

What is the definition of stream cipher quizlet?

What is a stream cipher? it is a generalized one-time pad but the key is very short which is then stretched to a key stream and then this key stream is used like a one-time pad (vernal ciphers)

Which of the following is the definition of stream cipher quizlet?

The term stream cipher refers to cryptography wherein two keys are used: one to encrypt the message and another to decrypt it.

Where are stream ciphers used?

Stream ciphers are often used in wireless protocols where block size cannot be determined prior to transmission. Stream ciphers come in two flavors: synchronous and self-synchronizing. Synchronous stream ciphers generate their keystreams independent of the plaintext and ciphertext.

What drawback are stream ciphers trying to overcome?

Stream ciphers are more difficult to implement correctly, and prone to weaknesses based on usage – since the principles are similar to one-time pad, the keystream has very strict requirements.

What is steam and block cipher?

Stream and Block Ciphers. An important distinction in symmetric cryptographic algorithms is between stream and block ciphers. Stream ciphers convert one symbol of plaintext directly into a symbol of ciphertext. Block ciphers encrypt a group of plaintext symbols as one block.

What’s the difference between a stream cipher and a block cipher quizlet?

What is the difference between a block cipher and a stream cipher? A block cipher processes the input one block of elements at a time, producing an output block for each input block. A stream cipher processes the input elements continuously, producing output one element at a time, as it goes along.

What are the components that make up a cryptosystem quizlet?

Terms in this set (5) Key generation algorithms. Encryption algorithms. Decryption algorithms. cryptosystem is a collection of algorithms needed to operate an encryption service.

Which of the following is the definition of inode?

The term inode refers to a data structure in the file system that stores all the information about a file except its name and its actual data.

Which is the best description of a stream cipher?

A stream cipher is a method of encrypting text (to produce ciphertext) in which a cryptographic key and algorithm are applied to each binary digit in a data stream, one bit at a time.

What is the definition of a block cipher?

A block cipher is a method of encrypting text (to produce ciphertext) in which a cryptographic key and algorithm are applied to a block of data (for example, 64 contiguous bits) at once as a group rather than to one bit at a time.

Can a 64 bit block cipher generate a keystream?

For example, 64-bit block ciphers like DES can be used to generate a keystream in output feedback (OFB) mode. However, when not using full feedback, the resulting stream has a period of around 2 32 blocks on average; for many applications, the period is far too low.

Why are binary stream ciphers often constructed using LFSRs?

Binary stream ciphers are often constructed using linear-feedback shift registers (LFSRs) because they can be easily implemented in hardware and can be readily analysed mathematically. The use of LFSRs on their own, however, is insufficient to provide good security. Various schemes have been proposed to increase the security of LFSRs.