Question: The following message, encrypted by a Vigenere cipher, is received: GLCF DLCY YMLY OXQL YYEZ DLCL YYEZ QIRY YML The index of coincidence of the

The following message, encrypted by a Vigenere cipher, is received: GLCF DLCY YMLY OXQL YYEZ DLCL YYEZ QIRY YML

The index of coincidence of the encrypted message is 0.109. What is the reason behind it being so high?

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