If we have an array of ciphertexts based on the same data encrypted with different keys (e.g. sharing the data with different persons using different 128 bit keys), then is it easier to an attacker to guess the data without knowing any of the keys? If so, then is there a way to harden this kind of encryption? (To be more specific the data is a 128 bit group key encrypted with the personal key of each person.)
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