python实现凯撒加密和暴力破解_python字符串加密 凯撒密码

编写程序，要求输入一个字符串，然后输入一个整数作为凯撒加密算法的密钥，输出该字符串加密后的结果。（提示：凯撒加密是一种替换加密的技术，明文中的所有字母都在字母表上向后（或向前）按照一个固定数目n进行偏移后被替换成密文，此处的n就是密钥。）

'''
import string
def kaisa(s,k):
    lower=string.ascii_lowercase
    upper=string.ascii_uppercase
    before=string.ascii_letters
    after=lower[k:]+lower[:k]+upper[k:]+upper[:k]
    table=''.maketrans(before,after)
    return s.translate(table)
s=input('input string:')
k=int(input('input int security-key:'))
print(kaisa(s,k))
'''
 
'''
#凯撒加密
import string
#upper and lower letters
print(string.ascii_letters)
#0123456789
print(string.digits)
#a string containing all ASCII punctuation characters
print(string.punctuation)
#upper letters
print(string.ascii_uppercase)
#lower letters
print(string.ascii_lowercase)
uInput=input('input string:')
secKey=int(input('input int security-key:'))
#secKey=6
lower=string.ascii_lowercase
upper=string.ascii_uppercase
before=string.ascii_letters
after=lower[secKey:]+lower[:secKey]+upper[secKey:]+upper[:secKey]
#print(after)
table=''.maketrans(before,after)
#print(table)
print(uInput.translate(table))
'''
 
'''
#凯撒加密
key=int(input('input caesar encrypt key( key>0 ):'))
inputstr=input('input string:')
inputStrLower=inputstr.lower()
#print(key)
#print(inputstr)
encryptstr=''
letters='abcdefghijklmnopqrstuvwxyz'
for i in inputStrLower:
    if i in letters:
        num1=letters.index(i)+1
        encryptkey=num1+key
        if encryptkey>26:
            encryptkey=encryptkey%26
        
        #print(encryptkey)
        encryptstr=encryptstr+letters[encryptkey-1]
    
print(encryptstr)
'''
 
'''
#凯撒加密破解
encryptStr='klmnopqrstuvwxyzabcdefghij'
letters='abcdefghijklmnopqrstuvwxyz'
for key in range(1,27):
    decryptstr=''
    print(key)
    for j in encryptStr:
        if j in letters:
            num2=letters.index(j)
            decryptkey=num2+key
            if decryptkey>26:
                decryptkey=decryptkey%26
            
            decryptstr=decryptstr+letters[decryptkey-1]
    print(decryptstr)
    print('---------------------')
'''
 
'''
#凯撒加密-python密码学编程
message='guvF vF FrpErG zrFFntr.'
key=13
mode='encrypt'
LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
translated=''
messagge=message.upper()
for symbol in message:
    print(symbol)
    if symbol in LETTERS:
        num=LETTERS.find(symbol)
        if mode=='encrypt':
            num=num+key
        elif mode=='decrypt':
            num=num-key
        
        if num>=len(LETTERS):
            num=num-len(LETTERS)
        elif num<0:
            num=num+len(LETTERS)
        translated=translated+LETTERS[num]
    
    else:
        translated=translated+symbol
print(translated)
'''