WEP Encryption Steps

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4 Terms

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Step 1

Compute the CRC for the message

  • CRC-32 polynomial is used

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Step 2

Compute the keystream

  • IV is concatenated (joined) with the key

  • RC4 encryption algorithm is used on the 64 or 128 bit concatenation

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Step 3

Encrypt the plaintext

  • The plaintext is XORed with the keystream to form the ciphertext

  • The IV is prepended (put at the beginning) to the ciphertext

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Step 4

  • ICV computed — 32-bit CRC of payload

  • One of four keys selected — 40-bits

  • IV selected — 24-bits, prepended to keynumber

  • IV+key used to encrypt payload + ICV

  • IV+keynumber prepended to encrypted payload + ICV