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Key conversion method, system and device for homomorphic cryptographic operation and readable storage medium

A conversion method and key technology, applied in the direction of homomorphic encryption communication, transmission system, digital transmission system, etc., can solve the problems of low operation efficiency, complex calculation of fully homomorphic encryption scheme, large key size, etc., and achieve accelerated operation. speed, reduced computation time, short time effect

Active Publication Date: 2020-12-29
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the problem that the original fully homomorphic encryption scheme designed based on the RLWE problem has complex calculations and large key size, resulting in low operating efficiency. The present invention proposes a key conversion method, system, and Device and readable storage medium

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  • Key conversion method, system and device for homomorphic cryptographic operation and readable storage medium
  • Key conversion method, system and device for homomorphic cryptographic operation and readable storage medium
  • Key conversion method, system and device for homomorphic cryptographic operation and readable storage medium

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Embodiment Construction

[0048] Below in conjunction with specific embodiment the present invention is described in further detail, described is explanation of the present invention rather than limitation.

[0049] Such as figure 2 and 3 As shown, the present invention discloses a key conversion system oriented to homomorphic cryptographic operations, including a conversion key generation module and a key conversion module; the conversion key generation module is used to process externally input ciphertext data, Convert the extended secret key parameters required by the key conversion module, and cache the externally input ciphertext data, and pass the extended secret key parameters and cached data to the key conversion module; the key conversion module is used to convert the The extended secret key parameters and the ciphertext of the cached data are used as input, and the dimensionality reduction of the ciphertext is realized through the polynomial operation and finally the modulo operation.

[0...

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Abstract

The invention relates to the technical field of homomorphic encryption, in particular to a key conversion method for homomorphic cryptographic operation, and the method comprises the following steps:processing ciphertext data input from the outside, converting the ciphertext data into extended key parameters, and caching the data input from the outside; performing polynomial operation on the extended key parameter and the cache data, and finally performing modular operation to obtain a dimension-reduced ciphertext. The invention further discloses a key conversion system for homomorphic cryptographic operation. The key conversion system comprises a conversion key generation module and a key conversion module. The invention also discloses computer equipment and a computer readable storage medium. When a computer program is executed by the processor, the steps of the key conversion method for homomorphic cryptographic operation are realized. The problems that an original fully homomorphic encryption scheme designed based on the RLWE problem is complex in calculation and large in secret key size, and consequently the operation efficiency is low are solved.

Description

technical field [0001] The present invention relates to the technical field of homomorphic encryption, in particular to a key conversion method, system, device and readable storage medium for homomorphic cryptographic operations. Background technique [0002] Homomorphic Encryption (HE) essentially refers to such an encryption function, which performs ring addition and multiplication operations on the plaintext to re-encrypt, and performs corresponding operations on the ciphertext after encryption, and the result is equivalent. An encryption function with homomorphic properties is an encryption function that specifies that a text a satisfies Dec(f(Enc(a)))=f(a), where Enc is an encryption operation, Dec is a decryption operation, and f is an operation on the ciphertext domain . When f represents addition, the encryption is called additive homomorphic encryption; when f represents multiplication, the encryption is called multiplicative homomorphic encryption. This ensures t...

Claims

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Application Information

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IPC IPC(8): H04L9/00H04L9/08
CPCH04L9/008H04L9/0869
Inventor 杨晨任嵩楠苏阳伍民顺耿莉
Owner XI AN JIAOTONG UNIV
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