HEaaN::Decryptor Class Reference

Abstract entity for decrypting ciphertexts. More...

#include <Decryptor.hpp>

Public Member Functions
	Decryptor (const Context &context)
void	decrypt (const Ciphertext &ctxt, const SecretKey &sk, Message &msg) const
	Decrypt a ciphertext to message using a secret key. More...
void	decrypt (const Ciphertext &ctxt, const SecretKey &sk, Plaintext &ptxt) const
	Decrypt a ciphertext to plaintext using a secret key. More...
void	partialDecrypt (const Ciphertext &ctxt, const SecretKey &sk, Ciphertext &ctxt_out) const
	Partially decrypt a ciphertext, which is encrypted with a collectively generated encryption key, to another ciphertext using a secret key, generated by one of the parties. More...

Private Attributes
const Context	context_
	A context with which decryptor is associated. More...

Detailed Description

Abstract entity for decrypting ciphertexts.

Constructor & Destructor Documentation

Decryptor()

HEaaN::Decryptor::Decryptor ( const Context &  context )

explicit

Member Function Documentation

decrypt() [1/2]

void HEaaN::Decryptor::decrypt	(	const Ciphertext &	ctxt,
		const SecretKey &	sk,
		Message &	msg
	)		const

Decrypt a ciphertext to message using a secret key.

Parameters

[in]	ctxt
[in]	sk
[out]	msg

decrypt() [2/2]

void HEaaN::Decryptor::decrypt	(	const Ciphertext &	ctxt,
		const SecretKey &	sk,
		Plaintext &	ptxt
	)		const

Decrypt a ciphertext to plaintext using a secret key.

Parameters

[in]	ctxt
[in]	sk
[out]	ptxt

It sets the parameters of plaintext automatically. You may use any constructor of plaintext.

partialDecrypt()

void HEaaN::Decryptor::partialDecrypt	(	const Ciphertext &	ctxt,
		const SecretKey &	sk,
		Ciphertext &	ctxt_out
	)		const

Partially decrypt a ciphertext, which is encrypted with a collectively generated encryption key, to another ciphertext using a secret key, generated by one of the parties.

Parameters

[in]	ctxt
[in]	sk
[out]	ctxt_out

It sets the parameters of ciphertext automatically. You may use any constructor of ciphertext. ctxt should be encrypted with an encryption key which is generated by collective key generation. If ctxt is encrypted for the set of secret keys {sk_1 , ... , sk_n} and sk is one of the secret keys, ctxt_out is a ciphertext encrypted for the set of secret keys {sk_1, ... , sk_n} - {sk}. The parties of collective key generation may sequentially call partialDecrypt to decrypt the ciphertext. The last party may receive a ciphertext encrypted with a single sk_i, and call decrypt to get the decrypted plaintext.

Exceptions

RuntimeException

if the size of input ciphertext is not 2.

Member Data Documentation

context_

const Context HEaaN::Decryptor::context_

private

A context with which decryptor is associated.

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

• include/HEaaN/Decryptor.hpp