Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.04861 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911838508154880 |
|---|---|
| author | Qiu, Muyao Han, Jinguang |
| author_facet | Qiu, Muyao Han, Jinguang |
| contents | Functional encryption introduces a new paradigm of public key encryption that decryption only reveals the function value of encrypted data. To curb key leakage issues and trace users in FE-IP, a new primitive called traceable functional encryption for inner product (TFE-IP) has been proposed. However, the privacy protection of user's identities has not been considered in the existing TFE-IP schemes. In order to balance privacy and accountability, we propose the concept of privacy-preserving traceable functional encryption for inner product (PPTFE-IP) and give a concrete construction. Our scheme provides the following features: (1) To prevent key sharing, a user's key is bound with both his/her identity and a vector; (2) The key generation center (KGC) and a user execute a two-party secure computing protocol to generate a key without the former knowing anything about the latter's identity; (3) Each user can verify the correctness of his/her key; (4) A user can calculate the inner product of the two vectors embedded in his/her key and in a ciphertext; (5) Only the tracer can trace the identity embedded in a key. The security of our scheme is formally reduced to well-known complexity assumptions, and the implementation is conducted to evaluate its efficiency. The novelty of our scheme is to protect users' privacy and provide traceability if required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_04861 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Privacy-Preserving Traceable Functional Encryption for Inner Product Qiu, Muyao Han, Jinguang Cryptography and Security Functional encryption introduces a new paradigm of public key encryption that decryption only reveals the function value of encrypted data. To curb key leakage issues and trace users in FE-IP, a new primitive called traceable functional encryption for inner product (TFE-IP) has been proposed. However, the privacy protection of user's identities has not been considered in the existing TFE-IP schemes. In order to balance privacy and accountability, we propose the concept of privacy-preserving traceable functional encryption for inner product (PPTFE-IP) and give a concrete construction. Our scheme provides the following features: (1) To prevent key sharing, a user's key is bound with both his/her identity and a vector; (2) The key generation center (KGC) and a user execute a two-party secure computing protocol to generate a key without the former knowing anything about the latter's identity; (3) Each user can verify the correctness of his/her key; (4) A user can calculate the inner product of the two vectors embedded in his/her key and in a ciphertext; (5) Only the tracer can trace the identity embedded in a key. The security of our scheme is formally reduced to well-known complexity assumptions, and the implementation is conducted to evaluate its efficiency. The novelty of our scheme is to protect users' privacy and provide traceability if required. |
| title | Privacy-Preserving Traceable Functional Encryption for Inner Product |
| topic | Cryptography and Security |
| url | https://arxiv.org/abs/2404.04861 |