Is Trivium a secure stream cipher?

Is Trivium a secure stream cipher?

Trivium is designed to be both secure and efficient. The following sections discuss the two properties of Trivium. [3] classifies attacks against stream ciphers into two categories as follows: – Key recovery attacks, the goal of which is to recovery part or the whole key by observing the key stream.

What is Trivium in cryptography?

Trivium is a synchronous stream cipher designed to provide a flexible trade-off between speed and gate count in hardware, and reasonably efficient software implementation.

Which of the following components does the cipher Trivium use?

Trivium is a stream cipher that uses keystream generators comprised of Nonlinear-Feedback Shift Registers (NLFSR).

Can stream cipher reuse keys?

Reused key attack. Stream ciphers are vulnerable to attack if the same key is used twice (depth of two) or more. Say we send messages A and B of the same length, both encrypted using same key, K. The stream cipher produces a string of bits C(K) the same length as the messages.

Why is RC4 insecure?

Because RC4 is a stream cipher, it is more malleable than common block ciphers. If not used together with a strong message authentication code (MAC), then encryption is vulnerable to a bit-flipping attack. The cipher is also vulnerable to a stream cipher attack if not implemented correctly.

What is stream cipher in cryptography?

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.

Why one should not reuse a stream cipher key?

Making use of the same key for encryption with a stream cipher without the use of a nonce can lead to exposure of confidential data. This is because in stream ciphers, the incoming plaintext is XORed with the cipher’s keystream to produce the corresponding ciphertext.

Why are stream ciphers weak?

Stream ciphers are vulnerable to “key re-use” attacks, also called “two-time pad” attacks. This type of vulnerability occurs when you use the same key more than once because it is trivial to XOR the two ciphertext strings and nullify the key, which leaves only XOR’ed plain text.

Is RC4 an AES?

AES is a block cipher that operates on discrete blocks of data using a fixed key and a formula while RC4 is a stream cipher that does not have a discrete block size. Instead, it uses a keystream of pseudorandom bits that is combined to the data using an exclusive OR (XOR) operation.

Is AES a stream cipher?

AES-CTR is a stream cipher, of a particular kind where the keystream is obtained by encryption of a counter.

Why do we need stream ciphers?

Stream ciphers work well for large or small chucks of data. They`re suitable for smaller data sizes because no block size is required. And if speed is a concern, stream ciphers are your answer, because they use a simpler transformation that typically involves an xor`d keystream.

How many types of stream cipher are there?

two types
Stream ciphers are classified into two types: synchronous stream ciphers and self-synchronizing stream ciphers. However, self-synchronizing stream ciphers fell obsolete, mainly because of the existence of a resynchronization mechanism in most modern synchronous stream ciphers.