如何编写Ceaser密码Python [英] How to write a Ceaser Cipher Python
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问题描述
我不确定如何开始编写程序.
I am not sure how to start writing the program.
input = input("Input the text you would like encrypted")
def cipher_text(letter_code):
for i in input:
number_code = ord(i) + 3
letter_code = chr(number_code)
print(letter_code)
def plain_text(letter_code,regular_text):
for i in input:
regular_text = letter_code - 3
print(regular_text)
print("Encrypted text")
cipher_text()
print("Unencrypted text")
plain_text()
很抱歉,我不确定如何开始.另外,请提供建议而不是答案.
Sorry for the question I am not sure how to begin. Also please give advice not the answer.
推荐答案
在数学上,如果我们在 Caesar cipher
中看到 encryption
技术,则获得加密字母的公式为:
Mathematically, if we see encryption
technique in Caesar cipher
, then the formula to get encrypted letter is:
c = (x+n) mod 26,
其中 c
是加密字母的位置值, x
是实际字母的位置值,而 n
是移位.同样,要解密
每个字母,我们使用下面给出的公式:
where c
is place value of encrypted letter, x
is place value of actual letter and n
is the shift.
Similarly, to decrypt
each letter, we use the formula given below:
c = (x-n) mod 26
您可以使用下面的代码来了解如何实现 Caesar Cipher
:
You can use my below code to get an idea of how to implement Caesar Cipher
:
def encrypt(plain_text, s):
encrypted_text = ''
for i in range(len(plain_text)):
if plain_text[i] == ' ':
encrypted_text = encrypted_text + plain_text[i]
elif plain_text[i].isupper():
encrypted_text = encrypted_text + chr((ord(plain_text[i])+s-65)%26+65)
else:
encrypted_text = encrypted_text + chr((ord(plain_text[i])+s-97)%26+97)
return encrypted_text
def decrypt(encrypt_text, s):
decrypted_text = ''
for i in range(len(encrypt_text)):
if encrypt_text[i] == ' ':
decrypted_text = decrypted_text + encrypt_text[i]
elif encrypt_text[i].isupper():
decrypted_text = decrypted_text + chr((ord(encrypt_text[i])-s-65)%26+65)
else:
decrypted_text = decrypted_text + chr((ord(encrypt_text[i])-s-97)%26+97)
return decrypted_text
plain_text = input("Input the text you would like encrypted:")
s = int(input("Enter shift:"))
encrypt_text = encrypt(plain_text, s)
print("Encrypted text: {}".format(encrypt_text))
print("Decrypted text: {}".format(decrypt(encrypt_text, s)))
样本输出:
Input the text you would like encrypted:Taj Mahal
Enter shift:3
Encrypted text: Wdm Pdkdo
Decrypted text: Taj Mahal
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