Password Authentication for Web and Mobile Apps is now available in Amazon Kindle Store. If you like the convenience of buying your ebooks there, go get a copy! Don’t forget to leave a review after reading it.
The book continues to be available from my website. In fact, you and I get better value if you buy it directly from me: in addition to the MOBI version for Kindle, you’ll also get an EPUB that you can read on any device and a nicely formatted PDF version. You can pay with a credit card, PayPal, or even with your Amazon account (in some countries). And I get a bigger cut of what you paid 🙂