def decrypt(key, br): decoded = ' ' for i, c in enumerate(br): key_c = ord(key[i % len(key)]) br_c = ord(c) decoded +=(chr((br_c - key_c) % 127)) return decoded def encrypt(key, ar): encoded = '' for i in range(len(ar)): key_c = ord(key[i % len(key)]) ar_c = o...