information and security please help

5. For any block cipher, the fact that it is a nonlinear function is crucial to its security. To see this, suppose that we have a linear block cipher EL that encrypts 128-bit blocks of plaintext into 128-bit blocks of ciphertext. Let EL (K,) denote the encryption of a 128-bit message m under key K (the actual bit length of K is irrelevant). Thus, EL(K(me@my)) = EL(K. (ort:)) EL(K(+1)) for all 128-bit patteris t, 1989 Describe how, with 128 chosen ciphertexts, an adversary can decrypt any ciphertext without the knowledge of secret key K. (A "chosen cihpertext" means that an adversary has the ability to choose a ciphertect and then obtain its decryption. Here, you have 128 plaintext/dphertext pairs to work with and you have the ability to choose the value of the ciphertexts.) (8 points)