### Abstract

Pairing-based cryptosystems have been widely researched, and several efficient hardware implementations of pairings have also been proposed. However, side channel attacks (SCAs) are serious attacks on hardware implementations. Whelan et al. pointed out that pairings except the η _{T} pairing might not be vulnerable against SCAs by setting the secret point to the first parameter [25]. This paper deals with SCAs for the η _{T} pairing over . To our knowledge, the randomized-projective-coordinate method has the smallest overhead among all countermeasures against SCAs for the η _{T} pairing. The cost of that overhead is 3nM, where M is the cost of a multiplication in . In this paper, we propose another countermeasure based on random value additions (x _{p} ∈+∈λ) and (y _{p} ∈+∈λ), where P∈=∈(x _{p} ,y _{p} ) is the input point, and λ is a random value in . The countermeasure using the random value addition was relatively slow in the case of the scalar multiplication of elliptic curve cryptosystems. However, in the case of the η _{T} pairing, we can construct an efficient countermeasure due to the form of the function for a point P∈=∈(x _{p} ,y _{p} ). The overhead of our proposed scheme is just 0.5nM, which is a reduction of more than 75% compared with the randomized-projective-coordinate method.

Original language | English |
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Title of host publication | Information Security Practice and Experience - 4th International Conference, ISPEC 2008, Proceedings |

Pages | 290-303 |

Number of pages | 14 |

DOIs | |

Publication status | Published - Apr 7 2008 |

Event | 4th Information Security Practice and Experience Conference, ISPEC 2008 - Sydney, NSW, Australia Duration: Apr 21 2008 → Apr 23 2008 |

### 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 | 4991 LNCS |

ISSN (Print) | 0302-9743 |

ISSN (Electronic) | 1611-3349 |

### Other

Other | 4th Information Security Practice and Experience Conference, ISPEC 2008 |
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Country | Australia |

City | Sydney, NSW |

Period | 4/21/08 → 4/23/08 |

### All Science Journal Classification (ASJC) codes

- Theoretical Computer Science
- Computer Science(all)

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## Cite this

*Information Security Practice and Experience - 4th International Conference, ISPEC 2008, Proceedings*(pp. 290-303). (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 4991 LNCS). https://doi.org/10.1007/978-3-540-79104-1_21