有人能告诉我为啥我的加密有效但我的解密无效吗?看下面的图片
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【中文标题】有人能告诉我为啥我的加密有效但我的解密无效吗?看下面的图片【英文标题】:Can someone tell me why my encrpyt works but not my decrpyt? look at picture below有人能告诉我为什么我的加密有效但我的解密无效吗?看下面的图片 【发布时间】:2015-11-10 17:50:21 【问题描述】:#Vigenere 密码 加密消息="" 模式="" Keywordcount = 0 #将所有内容设置为 0
while Mode != "encrypt" and Mode != "decrypt":
Mode = input('Do you want to encrypt or decrypt a message?')
Mode = Mode.lower()
if Mode == "encrypt":
Keyword=input('Please enter the keyword you want to use:')
Message=input('Please eneter the message you witsh to encrypt: ')
Keywordlength = len(Keyword)
for i in range(0, len(Message)):#
Messageencrypt = Message[i]
Keywordencrypt = Keyword[Keywordcount]
if Messageencrypt.isalpha():
if Messageencrypt.isupper():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt + Keywordencrypt
if CodedMessage > 90:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
elif Messageencrypt.islower():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt + Keywordencrypt
if CodedMessage > 122:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
else:
Encryptedletter = Messageencrypt
EncryptedMessage = EncryptedMessage + Encryptedletter
Keywordcount = Keywordcount + 1
if Keywordcount >= Keywordlength:
Keywordcount = 0
print(EncryptedMessage)
if Mode == "decrypt":
Keyword=input('Please enter the keyword you want to use:')
Message=input('Please eneter the message you witsh to decrypt: ')
Keywordlength = len(Keyword)
for i in range(0, len(Message)):#
Messageencrypt = Message[i]
Keywordencrypt = Keyword[Keywordcount]
if Messageencrypt.isalpha():
if Messageencrypt.isupper():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
if CodedMessage > 90:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
elif Messageencrypt.islower():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
if CodedMessage > 122:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
else:
Encryptedletter = Messageencrypt
EncryptedMessage = EncryptedMessage + Encryptedletter
Keywordcount = Keywordcount + 1
if Keywordcount >= Keywordlength:
Keywordcount = 0
print(EncryptedMessage)
程序正确加密但不能正确解密 有人解释一下怎么回事
This image show what is what happens when i try to decrypt
【问题讨论】:
欢迎来到 Stack Overflow!您已经提供了代码,但没有显示它应该有什么问题。请edit您的问题提供示例输入、输出和预期输出。 【参考方案1】:试试这个:
#Vigenere Cipher
EncryptedMessage=""
Mode=""
Keywordcount = 0 #sets everything to 0
while Mode != "encrypt" and Mode != "decrypt":
Mode = input('Do you want to encrypt or decrypt a message?')
Mode = Mode.lower()
if Mode == "encrypt":
Keyword=input('Please enter the keyword you want to use:')
Message=input('Please eneter the message you wish to encrypt: ')
Keywordlength = len(Keyword)
for i in range(0, len(Message)):
Messageencrypt = Message[i]
Keywordencrypt = Keyword[Keywordcount]
if Messageencrypt.isalpha():
if Messageencrypt.isupper():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt + Keywordencrypt
if CodedMessage > 90:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
elif Messageencrypt.islower():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt + Keywordencrypt
if CodedMessage > 122:
CodedMessage = CodedMessage - 26
Encryptedletter = chr(CodedMessage)
else:
Encryptedletter = Messageencrypt
EncryptedMessage = EncryptedMessage + Encryptedletter
Keywordcount = Keywordcount + 1
if Keywordcount >= Keywordlength:
Keywordcount = 0
print(EncryptedMessage)
if Mode == "decrypt":
Keyword=input('Please enter the keyword you want to use:')
Message=input('Please eneter the message you wish to decrypt: ')
Keywordlength = len(Keyword)
for i in range(0, len(Message)):
Messageencrypt = Message[i]
Keywordencrypt = Keyword[Keywordcount]
if Messageencrypt.isalpha():
if Messageencrypt.isupper():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
if CodedMessage < 65:
CodedMessage = CodedMessage + 26
Encryptedletter = chr(CodedMessage)
elif Messageencrypt.islower():
Messageencrypt = ord(Messageencrypt)
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
if CodedMessage < 97:
CodedMessage = CodedMessage + 26
Encryptedletter = chr(CodedMessage)
else:
Encryptedletter = Messageencrypt
EncryptedMessage = EncryptedMessage + Encryptedletter
Keywordcount = Keywordcount + 1
if Keywordcount >= Keywordlength:
Keywordcount = 0
print(EncryptedMessage)
这些是我在 diff 格式中所做的更改:
--- old.py 2015-11-10 14:01:31.000000000 -0500
+++ new.py 2015-11-10 13:56:52.000000000 -0500
@@ -54,7 +54,7 @@
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
- if CodedMessage > 90:
+ if CodedMessage < 65:
CodedMessage = CodedMessage + 26
Encryptedletter = chr(CodedMessage)
elif Messageencrypt.islower():
@@ -62,7 +62,7 @@
Keywordencrypt = Keywordencrypt.upper()
Keywordencrypt = ord(Keywordencrypt) - 64
CodedMessage = Messageencrypt - Keywordencrypt
- if CodedMessage > 122:
+ if CodedMessage < 97:
CodedMessage = CodedMessage + 26
Encryptedletter = chr(CodedMessage)
else:
【讨论】:
我对 python 不太擅长,这对我来说需要一个月才能完成,所以我不太清楚你的意思,但是我爱你 比较我的版本中的第 24 和 57 行以及第 32 和 65 行。【参考方案2】:您在加密和解密(即if CodedMessage > 90:
)中对CodedMessage
变量使用了更高的边界检查。这适用于加密,因为您希望编码消息 ASCII 十进制代码大于原来的值,因为您正在添加密钥加密。但是,对于您的解密,您不是在添加,而是在减去密钥:
CodedMessage = Messageencrypt - Keywordencrypt
这意味着您现在希望CodedMessage
比以前更小,这使得上限检查毫无用处。然后,您可以将代码更改为:
if CodedMessage < 65: #for upper letters
if CodedMessage < 97: #for lower letters
【讨论】:
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