Patent ID: 7634086

Claim:
An encryption/decryption apparatus for encrypting/decrypting first data using an RC4 algorithm, comprising: a management unit including a wired equivalent privacy seed key generator for generating a WEP seed key based on a transmitter address of first data and a cipher suite value representing a cipher protocol type for the transmitter address, an RC4 key scheduler for generating S-Box data using the WEP seed key, and an S-Box data memory storing the S-Box data generated from the RC4 key scheduler for the transmitter addresses; an encryption/decryption unit having a core for performing the RC4 algorithm corresponding to the cipher suite, encrypting/decrypting the first data using the S-Box data transmitted from the management unit, and transmitting a signal for previously generating the S-Box data of second data to the management unit; and a first interface for transmitting a control signal and a data signal between the management unit and the encryption/decryption unit.