What are the advantages and disadvantages of stream versus block ciphers|Legit essays

Posted: January 23rd, 2023

Write a 4page paper (deliverable length does not include the title and reference pages)

  • What are the advantages and disadvantages of stream versus block ciphers?
  • Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?

SOLUTION

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Stream ciphers and block ciphers are both types of symmetric-key encryption, which means they use the same key for both encryption and decryption.

Advantages of stream ciphers:

  • They are typically faster and require less computational power than block ciphers.
  • They can encrypt data in real-time, as it is being transmitted.
  • They can encrypt individual bits or bytes of data, which makes them well suited for encrypting data streams or communications.

Disadvantages of stream ciphers:

  • They are not well suited for encrypting large amounts of data, such as entire files or disk drives, because they do not divide the plaintext into fixed-size blocks.
  • They may be vulnerable to certain types of attacks, such as replay attacks, if the same keystream is reused.

Advantages of block ciphers:

  • They can encrypt large amounts of data, such as entire files or disk drives.
  • They divide the plaintext into fixed-size blocks, which can make them more resistant to certain types of attacks.
  • They are well-suited for use in other cryptographic primitives, such as message authentication codes (MACs) and cryptographic hash functions.

Disadvantages of block ciphers:

  • They are typically slower and require more computational power than stream ciphers.
  • They cannot encrypt data in real-time, as it is being transmitted.

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