ИБ 6 лаба

message = input("Enter message:\n") # ЛЮБЛЮ_КРИПТОГРАФИЮ
key = input("Enter key:\n") # 615342
string_key = input("Enter string key:\n") #санек

res_message = ""
a = []
des_message = ""
a1 = []

for i in range(int(len(message)/len(key))):
    a.append(message[i * (len(key)):len(key) * (i + 1)])

for i in range(1, len(key) + 1):
    index = key.index(str(i))
    for word in a:
        res_message += word[index]

res_message = string_key[:int(len(string_key)/2)] + res_message + string_key[int(len(string_key)/2):]
print("Coded message", res_message)

res_message = res_message[int(len(string_key)/2):]

for i in range(int(len(key))):
    a1.append(res_message[i * int(len(message)/len(key)):int(len(message)/len(key)) * (i + 1)])

for j in range(int(len(message)/len(key))):
    for i in range(len(key)):
        index = int(key[i])
        number_str = a1[index - 1]
        if number_str[j] not in string_key:
            des_message += number_str[j]

print("Decoded message:", des_message)