TooLIP: How to Find New Instances of FiLIP Cipher With Smaller Key Size and New Filters

GERARD, François; GINI, Agnese; MEAUX, Pierrick

doi:10.1007/978-3-031-64381-1_2

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TooLIP: How to Find New Instances of FiLIP Cipher With Smaller Key Size and New Filters

GERARD, François; GINI, Agnese; MEAUX, Pierrick

2024 • In Africacrypt

Peer reviewed

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https://hdl.handle.net/10993/60234

DOI
10.1007/978-3-031-64381-1_2

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Keywords :

Automatic tool, Stream ciphers, FiLIP cipher, Boolean functions.

Abstract :

[en] In this article, we propose a new tool to evaluate the security of instances of FiLIP cipher. TooLIP is user friendly, it automatically evaluates the cost of several attacks on user-defined Boolean functions. It allows to test new families of filters that are more homomorphic friendly for recent techniques of evaluations, and is designed to easily add new attacks, or change parameters in the considered attacks. To demonstrate our tool we apply it in three contexts. First we show how the keysize can be reduced for former instances with XOR-Threshold functions when the amount of encrypted plaintext obtained by the adversary is limited. Then, we use TooLIP to determine secure instances with filters in less variables for two new families of Boolean functions, leading to a more efficient evaluation and/or a reduced bandwidth. Finally, we apply it to find other instances with filters where we know only (bounds on) the algebraic immunity and resiliency.

Disciplines :

Computer science

Author, co-author :

GERARD, François ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > PI Coron

GINI, Agnese ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust > PI Coron > Team Jean-Sébastien CORON

MEAUX, Pierrick ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > PI Coron

External co-authors :

Language :

English

Title :

TooLIP: How to Find New Instances of FiLIP Cipher With Smaller Key Size and New Filters

Publication date :

2024

Event name :

Africacrypt

Event date :

10/07 to 12/07

Audience :

International

Main work title :

Africacrypt

Publisher :

Springer

Peer reviewed :

Peer reviewed

Focus Area :

Security, Reliability and Trust

European Projects :

H2020 - 787390 - CLOUDMAP - Cloud Computing via Homomorphic Encryption and Multilinear Maps

Funders :

Union Européenne [BE]

Funding number :

ERC Advanced Grant no.787390.

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since 16 February 2024

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