WASHINGTON - Details emerged Thursday behind the break-in of Republican vice presidential candidate Sarah Palin's e-mail account, including a first-hand account suggesting it was vulnerable because a hacker was able to impersonate her online to obtain her password.

The hacker guessed that Alaska's governor had met her husband in high school, and knew Palin's date of birth and home ZIP code. Using those details, the hacker tricked Yahoo Inc.'s service into assigning a new password, "popcorn," for Palin's e-mail account, according to a chronology of the crime published on the Web site where the hacking was first revealed.