[Retracted] Blockchain-Based Information Supervision Model for Rice Supply Chains

Algorithm 1

Process of AES encryption.

	Input: plaintext, key
	Output: ciphertext
	/∗ First, the algorithm expands the input key and stores it in W ∗/
	AddRoundKey(state,w) // Bitwise XOR between the extended key in W and the matrix column
	state = plaintext
	for(r = 1; r <= Nr; r++) {
	SubBytes(state) // Find the S-box and output four new bytes to form word
	ShiftRows(state) // Each row of the matrix is shifted left circularly in bytes
	if(r ! = Nr) {
	MixColumns(state) // Column-by-column transformation of matrix
	}
	AddRoundKey(state, w) // In this round of encryption, XOR each column with the extended key
	}
	ciphertext = state