Realizing Flexible Broadcast Encryption: How to Broadcast to a Public-Key Directory

ePrint Report: Realizing Flexible Broadcast Encryption: How to Broadcast to a Public-Key Directory

Rachit Garg, George Lu, Brent Waters, David J. Wu

Suppose a user wants to broadcast an encrypted message to $K$ recipients. With public-key encryption, the sender would construct $K$ different ciphertexts, one for each recipient. The size of the broadcasted message then scales linearly with $K$. A natural question is whether the sender can encrypt the message with a ciphertext whose size scales sublinearly with the number …

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