Abstract
Multikey fully homomorphic encryption (MFHE) scheme enables homomorphic computation on data encrypted under different keys. To decrypt a result ciphertext, all the involved secret keys are required. For multi decryptor setting, decryption is a protocol with minimal interaction among parties. However, all prior schemes supporting the protocol are not secure in public channel against a passive external adversary who can see any public information not joining the protocol. Furthermore, the possible adversaries have not been defined clearly. In this paper, we revisit the security of MFHE and present a secure one-round decryption protocol. We apply it to one of existing schemes and prove the scheme is secure against possible static adversaries. As an application, we construct a two round multiparty computation without common random string.
Original language | English |
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Title of host publication | Cryptography and Coding - 17th IMA International Conference, IMACC 2019, Proceedings |
Editors | Martin Albrecht |
Publisher | Springer |
Pages | 236-251 |
Number of pages | 16 |
ISBN (Print) | 9783030351984 |
DOIs | |
State | Published - 2019 |
Event | 17th IMA International Conference on Cryptography and Coding, IMACC 2019 - Oxford, United Kingdom Duration: 16 Dec 2019 → 18 Dec 2019 |
Publication series
Name | Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) |
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Volume | 11929 LNCS |
ISSN (Print) | 0302-9743 |
ISSN (Electronic) | 1611-3349 |
Conference
Conference | 17th IMA International Conference on Cryptography and Coding, IMACC 2019 |
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Country/Territory | United Kingdom |
City | Oxford |
Period | 16/12/19 → 18/12/19 |
Bibliographical note
Publisher Copyright:© 2019, Springer Nature Switzerland AG.
Keywords
- MPC without CRS
- Multikey homomorphic encryption
- Security of MFHE