The basic concept of the protocol is to tie the financial authorization process with an online authentication. This additional security authentication is based on a three-domain model (hence the 3-D in the name itself). The three domains are:Wiki info
During the winter of 1917, the United States suffered a severe coal shortage and on December 26 President Woodrow Wilson commandeered the railroads on behalf of the United States government to move federal troops, their supplies, and coal. Treasury Secretary William Gibbs McAdoo was assigned the task of consolidating the railway lines for the war effort. All contracts between express companies and railroads were nullified and McAdoo proposed that all existing express companies be consolidated into a single company to serve the country's needs. This ended American Express's express business, and removed them from the ICC’s interest. The result was that a new company called the American Railway Express Agency formed in July 1918. The new entity took custody of all the pooled equipment and property of existing express companies (the largest share of which, 40%, came from American Express, who had owned the rights to the express business over 71,280 miles (114,710 km) of railroad lines, and had 10,000 offices, with over 30,000 employees).
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