Hence, dec(ϵ,c) gives anyone the index component of the plaintext an well as the bit length of m.
参考
1. Boneh, D., Sahai, A., Waters, B. (2011). Functional Encryption: Definitions and Challenges. In: Ishai, Y. (eds) Theory of Cryptography. TCC 2011. Lecture Notes in Computer Science, vol 6597. Springer, Berlin, Heidelberg. -3-642-19571-6_16
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