In 2017, Moxie Marlinspike and Trevor Perrin were awarded the The Levchin Prize for Real-World Cryptography for developing the Signal protocol. It’s a well-earned honor and I have no doubt that Signal is the best practical in-class encryption scheme for messaging that the cryptographic community knows about. But, securing communication requires more than encryption. The sender also needs to make sure the public keys that they intend to use are the right keys for the intended recipients. Thi...
