(1) For a country's digital money, see
CBDC.
(2) For blockchain-based money, see
cryptocurrency.
(3) With regard to e-commerce, credit cards and PayPal are the primary forms of digital money transfer. Web browsers and servers encrypt connections between user and online merchant (see
TLS). In the 2010s, mobile payment systems emerged as a major form of digital money. See
Web payment service and
mobile payment service.
Pre-21st Century
This 1996 book was all about transferring money over the Internet just as the Internet was emerging. Lynch and Lundquist wrote about "crypto" in the book, but it was about the cryptographic methods used to secure financial transactions. Cryptocurrency did not yet exist (see
cryptography).