Struct scicrypt::threshold_cryptosystems::integer_el_gamal::NOfNIntegerElGamal

pub struct NOfNIntegerElGamal;

N-out-of-N Threshold ElGamal cryptosystem over integers: Extension of ElGamal that requires n out of n parties to successfully decrypt. For this scheme there exists an efficient distributed key generation protocol.

Trait Implementations

impl AsymmetricNOfNCryptosystem for NOfNIntegerElGamal

type Plaintext = Integer

The type of the plaintexts to be encrypted.

type Ciphertext = IntegerElGamalCiphertext

The type of the encrypted plaintexts.

type RichCiphertext = RichIntegerElGamalCiphertext<'pk>

Rich representation of a ciphertext that associates it with the corresponding public key. This allows for performing homomorphic operations using operator overloading, among others.

type PublicKey = IntegerElGamalPublicKey

The type of the encryption key.

type PartialKey = Integer

The type of the partial key.

type DecryptionShare = (Integer, Integer)

The type of a decryption share, which can be combined with $t - 1$ other shares to finish decryption.

pub fn generate_keys<R>(
    security_param: &BitsOfSecurity,
    key_count_n: usize,
    rng: &mut SecureRng<R>
) -> (<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::PublicKey, Vec<<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::PartialKey, Global>) where
    R: RngCore + CryptoRng, 

Generate a public and private key pair using a cryptographic RNG.

pub fn encrypt<R>(
    plaintext: &<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::Plaintext,
    public_key: &<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::PublicKey,
    rng: &mut SecureRng<R>
) -> <NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::Ciphertext where
    R: RngCore + CryptoRng, 

Encrypt the plaintext using the public key and a cryptographic RNG.

pub fn partially_decrypt(
    rich_ciphertext: &RichIntegerElGamalCiphertext<'_>,
    partial_key: &<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::PartialKey
) -> <NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::DecryptionShare

Partially decrypt the ciphertext using a partial key and its related public key.

pub fn combine(
    decryption_shares: &[<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::DecryptionShare],
    public_key: &<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::PublicKey
) -> Result<<NOfNIntegerElGamal as AsymmetricNOfNCryptosystem>::Plaintext, DecryptionError>

Combine t decryption shares belonging to distinct partial keys to finish decryption. It is the responsibility of the programmer to supply the right number of decryption shares to this function.