What does the following notation mean in a homomorphic encryption scheme?
ENC(x;r)
What does x and r refer to?
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was closed as 'unclear what you're asking'. Might not be a 'difficult' question, but its very clear – Cryptographeur Feb 04 '14 at 20:39
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2Does this answer your question? ElGamal Homomorphic Encryption Formula Question – fgrieu Jan 17 '20 at 11:51
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The question is both unclear, and a duplicate of the clearer ElGamal Homomorphic Encryption Formula Question – fgrieu Jan 17 '20 at 11:53
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x is the plaintext and r is the randomness.
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ENC (X;r) in (G, q, g) is (g^r, h^r . g^m). Is my interpretation right? – user11706 Jan 30 '14 at 06:16
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ENC (X;r) in (G, q, g) is (g^r, h^r . g^X). How about now? Just want to get it right. Thanks. – user11706 Jan 30 '14 at 06:39
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That would be additive ElGamal. $:$ Two other possibilities are multiplicative ElGamal and Cramer-Shoup. $;;;$ – Jan 30 '14 at 21:11