Three key sizes for AES encryption.

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  1. Explain the three key sizes for AES encryption.
  2. Make a reasonable guess as to computation time to guess one key.
  3. Try to encrypt a plaintext of your choice with AES (any key size). You may use any AES encryption tool (e.g., AES Crypt (Links to an external site.)) or any online AES encryption service. Confirm that the encryption was valid by decrypting the ciphertext back to the original plaintext. Describe the AES version, plaintext, key, and ciphertext. Please provide screenshots. Here are some examples:
    o Online Domain Tools (Links to an external site.). (n.d.).
    o InfoEncrypt (Links to an external site.). (n.d.).
    o Encipher.it (Links to an external site.). (n.d.).
  4. Explain what a block cipher is and where it might be used?
  5. Give examples of different types of block ciphers and their uses.
  6. What are the goals of network security?
  7. Compare and contrast the differences between a stream cipher and hash function?

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