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维吉尼亚

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运行环境python3

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key='helloworld'
plaintext='whereisthekey'
#key='relations'
#plaintext='tobeornottobeth'
 
ascii='abcdefghijklmnopqrstuvwxyz'
keylen=len(key)
ptlen=len(plaintext)
ciphertext = ''
i = 0
while i < ptlen:
    j = i % keylen
    k = ascii.index(key[j])
    m = ascii.index(plaintext[i])
    ciphertext += ascii[(m+k)%26]
    i += 1
 
print (ciphertext)

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