# readonly chainIndex
Returns the index of the parameter set in a chain. The initial parameters have index 0 and the index increases sequentially in the parameter chain.
SecurityLevel.none | SecurityLevel.tc128 | SecurityLevel.tc192 | SecurityLevel.tc256
# readonly securityLevel
Tells whether the encryption parameters are secure based on the standard parameters from HomomorphicEncryption.org security standard.
# readonly usingBatching
Tells whether batching is supported by the encryption parameters. If the plaintext modulus is congruent to 1 modulo 2N, where X^N+1 is the polynomial modulus and N is a power of two, then it is possible to use the BatchEncoder class to view plaintext elements as 2-by-(N/2) matrices of integers modulo the plaintext modulus. This is called batching, and allows the user to operate on the matrix elements (slots) in a SIMD fashion, and rotate the matrix rows and columns. When the computation is easily vectorizable, using batching can yield a huge performance boost. If the encryption parameters support batching, the variable using_batching is set to true.
# readonly usingDescendingModulusChain
Tells whether the coefficient modulus consists of a set of primes that are in decreasing order. If this is true, certain modular reductions in base conversion can be omitted, improving performance.
# readonly usingFastPlainLift
Tells whether fast plain lift is supported by the encryption parameters. A certain performance optimization in multiplication of a ciphertext by a plaintext (Evaluator::multiply_plain) and in transforming a plaintext element to NTT domain (Evaluator::transform_to_ntt) can be used when the plaintext modulus is smaller than each prime in the coefficient modulus. In this case the variable using_fast_plain_lift is set to true.
# readonly usingFFT
Tells whether FFT can be used for polynomial multiplication. If the polynomial modulus is of the form X^N+1, where N is a power of two, then FFT can be used for fast multiplication of polynomials modulo the polynomial modulus. In this case the variable using_fft will be set to true. However, currently Microsoft SEAL requires this to be the case for the parameters to be valid. Therefore, parameters_set can only be true if using_fft is true.
# readonly usingNTT
Tells whether NTT can be used for polynomial multiplication. If the primes in the coefficient modulus are congruent to 1 modulo 2N, where X^N+1 is the polynomial modulus and N is a power of two, then the number-theoretic transform (NTT) can be used for fast multiplications of polynomials modulo the polynomial modulus and coefficient modulus. In this case the variable using_ntt will be set to true. However, currently Microsoft SEAL requires this to be the case for the parameters to be valid. Therefore, parameters_set can only be true if using_ntt is true.
Delete the underlying WASM instance. Should be called before dereferencing this object to prevent the WASM heap from growing indefinitely.