solana_zk_token_sdk::encryption

Module grouped_elgamal

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The twisted ElGamal group encryption implementation.

The message space consists of any number that is representable as a scalar (a.k.a. “exponent”) for Curve25519.

A regular twisted ElGamal ciphertext consists of two components:

  • A Pedersen commitment that encodes a message to be encrypted
  • A “decryption handle” that binds the Pedersen opening to a specific public key The ciphertext can be generalized to hold not a single decryption handle, but multiple handles pertaining to multiple ElGamal public keys. These ciphertexts are referred to as a “grouped” ElGamal ciphertext.

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