## In Code: A Mathematical JourneyIn January 1999, Sarah Flannery, a sports-loving teenager from Blarney in County Cork, Ireland, was awarded Ireland's Young Scientist of the Year for her extraordinary research and discoveries in Internet cryptography. The following day, her story began appearing in Irish papers and soon after was splashed across the front page of the London Times, complete with a photo of Sarah and a caption calling her "brilliant." Just sixteen, she was a mathematician with an international reputation. IN CODE is a heartwarming story that will have readers cheering Sarah on. Originally published in England and cowritten with her mathematician father, David Flannery, IN CODE is "a wonderfully moving story about the thrill of the mathematical chase" (Nature) and "a paean to intellectual adventure" (Times Educational Supplement). A memoir in mathematics, it is all about how a girl next door, nurtured by her family, moved from the simple math puzzles that were the staple of dinnertime conversation to prime numbers, the Sieve of Eratosthenes, Fermat's Little Theorem, googols-and finally into her breathtaking algorithm. Parallel with each step is a modest girl's own self-discovery-her values, her burning curiosity, the joy of persistence, and, above all, her love for her family. |

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#### In code: a mathematical journey

User Review - Not Available - Book Verdict"I have no doubt that I am not a genius," writes Sarah Flannery, the 16-year-old Irish girl who won first place in the 1999 European Union Contest for Young Scientists. Nonetheless, her project ... Read full review

### Contents

Early Influences | 3 |

Early Challenges | 8 |

Beginning My First Project | 32 |

Mathematical Excursions | 41 |

Dads Evening Class | 43 |

Of Prime Importance | 47 |

The Arithmetic of Cryptography | 71 |

Sums with a Difference | 113 |

Young Scientist 99 | 218 |

AfterMath | 229 |

Media Blitz | 231 |

Around the World and Back | 254 |

About This Book | 269 |

CryptographyA New Algorithm Versus the RSA | 271 |

Answers to Miscellaneous Questions | 297 |

Euclids Algorithm | 305 |

One Way Only | 149 |

Public Key Cryptography | 164 |

Exhibition Time | 187 |

Young Scientist 98 | 189 |

The Birth of a Project | 194 |

The Euler ϕfunction and the EulerFermat Theorem | 315 |

Acknowledgments | 320 |

323 | |

325 | |