python - 使用循环密码加密消息

Question

这是一个例子:

• 普通:ABCDEFGHIJKLMNOPQRSTUVWXYZ
• Shift = 4
• 密码:DEFGHIJKLMNOPQRSTUVWXYZABC

代码如下:

print ("This is a cyclic cipher program that will encrypt messages.")

#phrase = input("Please enter a phrase to encrypt.")
phrase = "ABCDEFG"
#shift_value = int(input ("Please enter a shift value between 1 - 5."))
shift_value = 1
encoded_phrase = ""
ascii_codes = 0
x = ""
#accepted_ascii_codes = range(65,90) and range(97,122)

for c in phrase:
ascii_codes = ord(c) # find ascii codes for each charcter in phrase
ascii_codes = ascii_codes + shift_value # add an integer (shift value) to ascii codes
phrase_rest = chr(ascii_codes) # convert ascii codes back to characters
encoded_phrase = encoded_phrase + c # stores the phrase character in a new variable
encoded_phrase = encoded_phrase.replace(c,phrase_rest) # replace original character

print (phrase) # prints "ABCDEFG"
print (encoded_phrase) # prints "HHHHHHH"

Answer 1

你在每个循环中重新编码你的加密字母，这可以达到目的:

for c in phrase:
  ascii_codes = ord(c) # find ascii codes for each charcter in phrase
  ascii_codes = ascii_codes + shift_value # add an integer (shift value) to ascii codes
  phrase_rest = chr(ascii_codes) # convert ascii codes back to characters
  encoded_phrase = encoded_phrase + phrase_rest # stores the phrase character in a new variable

但是，您可能想用原始字母和加密字母建立字典。然后你会遍历它们并得到加密的句子。例如:

cypher = {'a': 'x', 'b': 'y', ... }
encoded = ''
for c in phrase:
  encoded += cypher[c]