Patent ID: 7797745

Claim:
An apparatus of media access control (MAC) security transmission comprising: a frame classifier distinguishing the type of a frame, and based on a logical link identifier (LLID) of the distinguished frame, determining whether or not the frame is of a security link to which a security function is to be applied, wherein a frame to which the security function is to be applied is a security-function-applied frame; a bypass unit delaying a no-security-function frame so that a processing time for converting the security-function-applied frame classified in the frame classifier into an encrypted frame is the same as a processing time for the no-security-function frame; and a parameter generation unit transmitting in relation to each of a plurality of LLIDs, a parameter set used in the encryption, decryption and authentication of the frame, the parameter set including a security-function-application setting signal, a frame decryption signal, an encryption mode selection signal, and an authentication intensity adjustment signal, wherein the frame classifier receives the encryption mode selection signal as a mode parameter value for selecting an encryption algorithm from the parameter generation unit and selects whether an authentication decryption algorithm or an authentication algorithm is to be applied to the frame; and an encryption unit, wherein the authentication intensity adjustment signal is a parameter value ICV Size received by the encryption unit for confirming whether or not a frame is authenticated, wherein changing the ICV Size parameter value in the authentication decryption algorithm or the authentication algorithm changes the authentication intensity.