The hybrid virtual account and token-based digital cash pro tocols provide a user with many
pairs of secret and public keys. One of the pairs is the master pair, which consists of one …

The virtual account and token-based digital cash token protocols use a combination of blind
digital signatures and pseudonym authentication with at least two pairs of public and private …

An electronic transaction verification system comprising a client subsystem, a merchant
subsystem, and a transaction verification subsystem. The transaction verification subsystem …

A system includes a remote control device and a security device, wherein both devices
share a unique and constant common key, algorithms or protocol specific to a pair formed by …