I'm working on a second edition of _Disappearing Cryptography_, a book about steganography and anonymity on-line. Last week, I offered a $10 reward for anyone who reports the technical errors in the first edition to me. This week I'm doubling the reward to $20 per error. Why? Because I've only gotten one report. That means there are either few errors or the incentive isn't large enough. So let's try again. Here are the rules: *) Only the first person to report an error wins a prize. This is the only way to avoid many people submitting the same error again and again and again. I reserve the right to pay duplicate prizes to people who appear to have submitted a duplicate in good faith. (The only one reported is on page 27 in a sentence describing the Euler Totient Function.) *) I reserve the right to decide the size of an error. If misspellings counted, spelling someone's name incorrectly throughout the entire book would only count as one error. *) First person is judged by the time the error arrives in my mailbox, pcw@flyzone.com. *) Only technical errors count. Grammar and spelling errors could bankrupt me, even after the copy editing fixes 99%. *) Please submit the page number. *) Please let me know if you want your name included in the thanks at the beginning of the book. Thank you. You're free to forward this offer to any other list. -Peter pcw@flyzone.com