My book, Bulletproof SSL and TLS, is available at 50% with the coupon BLACKFRIDAY: https://www.feistyduck.com/books/bulletproof-ssl-and-tls/blackFriday https://

My book, Bulletproof SSL and TLS, is available at 50% with the coupon BLACKFRIDAY: https://www.feistyduck.com/books/bulletproof-ssl-and-tls/blackFriday https://www.feistyduck.com/books/bulletproof-ssl-and-tls/bla... Please note that the discount on the bundle (paperback and digital formats) is about 48%, due to the coupon limitations of Shopify. For full disclosure: we currently have a small discount for everyone, and the coupon adds 40% on top of that.