PALISADE Lattice Crypto Library: lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element

Concrete feature class for Leveled SHEBGVrns operations. This class adds leveled (BGVrns scheme) features to the BGVrns scheme. More...

#include <bgvrns.h>

Inheritance diagram for lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >:

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Collaboration diagram for lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >:

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Public Member Functions
	LPLeveledSHEAlgorithmBGVrns ()

Ciphertext< Element >	ModReduceInternal (ConstCiphertext< Element > ciphertext, size_t levels=1) const override

void	ModReduceInternalInPlace (Ciphertext< Element > &ciphertext, size_t levels=1) const override

void	ModReduceInPlace (Ciphertext< Element > &ciphertext, size_t levels=1) const override

Ciphertext< Element >	Compress (ConstCiphertext< Element > ciphertext, size_t towersLeft=1) const override

Ciphertext< Element >	ComposedEvalMult (ConstCiphertext< Element > ciphertext1, ConstCiphertext< Element > ciphertext2, const LPEvalKey< Element > quadKeySwitchHint) const override

Ciphertext< Element >	LevelReduce (ConstCiphertext< Element > cipherText, const LPEvalKey< Element > linearKeySwitchHint, size_t levels) const override

Ciphertext< Element >	LevelReduceInternal (ConstCiphertext< Element > ciphertext, const LPEvalKey< Element > linearKeySwitchHint, size_t levels) const override

template<class Archive >
void	save (Archive &ar) const

template<class Archive >
void	load (Archive &ar)

std::string	SerializedObjectName () const

template<>
void	ModReduceInternalInPlace (Ciphertext< Poly > &ciphertext, size_t levels) const

template<>
void	ModReduceInternalInPlace (Ciphertext< NativePoly > &ciphertext, size_t levels) const

template<>
void	ModReduceInternalInPlace (Ciphertext< DCRTPoly > &ciphertext, size_t levels) const

template<>
Ciphertext< Poly >	ModReduceInternal (ConstCiphertext< Poly > ciphertext, size_t levels) const

template<>
Ciphertext< NativePoly >	ModReduceInternal (ConstCiphertext< NativePoly > ciphertext, size_t levels) const

template<>
Ciphertext< DCRTPoly >	ModReduceInternal (ConstCiphertext< DCRTPoly > ciphertext, size_t levels) const

template<>
void	ModReduceInPlace (Ciphertext< Poly > &ciphertext, size_t levels) const

template<>
void	ModReduceInPlace (Ciphertext< NativePoly > &ciphertext, size_t levels) const

template<>
void	ModReduceInPlace (Ciphertext< DCRTPoly > &ciphertext, size_t levels) const

template<>
Ciphertext< Poly >	Compress (ConstCiphertext< Poly > ciphertext, size_t towersLeft) const

template<>
Ciphertext< NativePoly >	Compress (ConstCiphertext< NativePoly > ciphertext, size_t towersLeft) const

template<>
Ciphertext< DCRTPoly >	Compress (ConstCiphertext< DCRTPoly > ciphertext, size_t towersLeft) const

template<>
Ciphertext< Poly >	ComposedEvalMult (ConstCiphertext< Poly > ciphertext1, ConstCiphertext< Poly > ciphertext2, const LPEvalKey< Poly > quadKeySwitchHint) const

template<>
Ciphertext< NativePoly >	ComposedEvalMult (ConstCiphertext< NativePoly > ciphertext1, ConstCiphertext< NativePoly > ciphertext2, const LPEvalKey< NativePoly > quadKeySwitchHint) const

template<>
Ciphertext< DCRTPoly >	ComposedEvalMult (ConstCiphertext< DCRTPoly > ciphertext1, ConstCiphertext< DCRTPoly > ciphertext2, const LPEvalKey< DCRTPoly > quadKeySwitchHint) const

template<>
Ciphertext< Poly >	LevelReduceInternal (ConstCiphertext< Poly > ciphertext, const LPEvalKey< Poly > linearKeySwitchHint, size_t levels) const

template<>
Ciphertext< NativePoly >	LevelReduceInternal (ConstCiphertext< NativePoly > ciphertext, const LPEvalKey< NativePoly > linearKeySwitchHint, size_t levels) const

template<>
Ciphertext< DCRTPoly >	LevelReduceInternal (ConstCiphertext< DCRTPoly > ciphertext, const LPEvalKey< DCRTPoly > linearKeySwitchHint, size_t levels) const

template<>
Ciphertext< Poly >	LevelReduce (ConstCiphertext< Poly > ciphertext, const LPEvalKey< Poly > linearKeySwitchHint, size_t levels) const

template<>
Ciphertext< NativePoly >	LevelReduce (ConstCiphertext< NativePoly > ciphertext, const LPEvalKey< NativePoly > linearKeySwitchHint, size_t levels) const

template<>
Ciphertext< DCRTPoly >	LevelReduce (ConstCiphertext< DCRTPoly > ciphertext, const LPEvalKey< DCRTPoly > linearKeySwitchHint, size_t levels) const

Public Member Functions inherited from lbcrypto::LPLeveledSHEAlgorithm< Element >
virtual Ciphertext< Element >	ModReduce (ConstCiphertext< Element > ciphertext, size_t levels=1) const

virtual void	LevelReduceInternalInPlace (Ciphertext< Element > &cipherText1, const LPEvalKey< Element > linearKeySwitchHint, size_t levels) const

virtual Ciphertext< Element >	EvalPoly (ConstCiphertext< Element > cipherText, const std::vector< double > &coefficients) const

template<class Archive >
void	save (Archive &ar, std::uint32_t const version) const

template<class Archive >
void	load (Archive &ar, std::uint32_t const version)

std::string	SerializedObjectName () const

Detailed Description

template<class Element>
class lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >

Concrete feature class for Leveled SHEBGVrns operations. This class adds leveled (BGVrns scheme) features to the BGVrns scheme.

We use advances from the BGVrns scheme for levelled homomorphic capabilities from here:

Brakerski Z., Gentry C., Halevi S. (2013) Packed Ciphertexts in LWE-Based Homomorphic Encryption. In: Kurosawa K., Hanaoka G. (eds) Public-Key Cryptography � PKC 2013. Lecture Notes in Computer Science, vol 7778. Springer, Berlin, Heidelberg (https://eprint.iacr.org/2011/277.pdf).

Template Parameters

Element a ring element.

Constructor & Destructor Documentation

◆ LPLeveledSHEAlgorithmBGVrns()

template<class Element >

lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::LPLeveledSHEAlgorithmBGVrns ( )

inline

Default constructor

Member Function Documentation

◆ ComposedEvalMult()

template<class Element >

Ciphertext<Element> lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::ComposedEvalMult	(	ConstCiphertext< Element >	ciphertext1,
		ConstCiphertext< Element >	ciphertext2,
		const LPEvalKey< Element >	quadKeySwitchHint
	)		const

overridevirtual

Method for Composed EvalMult, which includes homomorphic multiplication, key switching, and modulo reduction.

Parameters

ciphertext1	ciphertext1, first input ciphertext to perform multiplication on.
ciphertext2	cipherText2, second input ciphertext to perform multiplication on.
quadKeySwitchHint	is used for EvalMult operation.

Returns: resulting ciphertext.

Implements lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ Compress()

template<class Element >

Ciphertext<Element> lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::Compress	(	ConstCiphertext< Element >	ciphertext,
		size_t	towersLeft = `1`
	)		const

overridevirtual

Method for compressing the ciphertext before decryption.

Parameters

ciphertext	is the ciphertext to perform compress on.
towersLeft	is the number of towers after compression

Returns: ciphertext after the compression performed.

Reimplemented from lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ LevelReduce()

template<class Element >

Ciphertext<Element> lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::LevelReduce	(	ConstCiphertext< Element >	cipherText,
		const LPEvalKey< Element >	linearKeySwitchHint,
		size_t	levels
	)		const

overridevirtual

Wrapper method for level reduce in BGVrns.

Parameters

cipherText1	is the original ciphertext to be level reduced.
linearKeySwitchHint	not used in the BGVrns scheme.
levels	the number of towers to drop.

Returns: resulting ciphertext.

Implements lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ LevelReduceInternal()

template<class Element >

Ciphertext<Element> lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::LevelReduceInternal	(	ConstCiphertext< Element >	ciphertext,
		const LPEvalKey< Element >	linearKeySwitchHint,
		size_t	levels
	)		const

overridevirtual

Method for Level Reduction in the BGVrns scheme. It just drops "levels" number of the towers of the ciphertext without changing the underlying plaintext.

Parameters

ciphertext	is the original ciphertext to be level reduced.
linearKeySwitchHint	not used in the BGVrns scheme.
levels	the number of towers to drop.

Returns: resulting ciphertext.

Reimplemented from lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ ModReduceInPlace()

template<class Element >

void lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::ModReduceInPlace	(	Ciphertext< Element > &	ciphertext,
		size_t	levels = `1`
	)		const

overridevirtual

Method for rescaling in-place.

Parameters

ciphertext is the ciphertext to perform modreduce on in-place

Implements lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ ModReduceInternal()

template<class Element >

Ciphertext<Element> lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::ModReduceInternal	(	ConstCiphertext< Element >	ciphertext,
		size_t	levels = `1`
	)		const

overridevirtual

Method for rescaling.

Parameters

ciphertext is the ciphertext to perform modreduce on.

Returns: ciphertext after the modulus reduction performed.

Reimplemented from lbcrypto::LPLeveledSHEAlgorithm< Element >.

◆ ModReduceInternalInPlace()

template<class Element >

void lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >::ModReduceInternalInPlace	(	Ciphertext< Element > &	ciphertext,
		size_t	levels = `1`
	)		const

overridevirtual

Method for rescaling in-place

Parameters

ciphertext is the ciphertext to perform modreduce on in-place

Reimplemented from lbcrypto::LPLeveledSHEAlgorithm< Element >.

The documentation for this class was generated from the following file:

src/pke/include/scheme/bgvrns/bgvrns.h

Public Member Functions

Detailed Description

template<class Element> class lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >

Constructor & Destructor Documentation

◆ LPLeveledSHEAlgorithmBGVrns()

Member Function Documentation

◆ ComposedEvalMult()

◆ Compress()

◆ LevelReduce()

◆ LevelReduceInternal()

◆ ModReduceInPlace()

◆ ModReduceInternal()

◆ ModReduceInternalInPlace()

template<class Element>
class lbcrypto::LPLeveledSHEAlgorithmBGVrns< Element >