But RSA, the security division of EMC, says 220 companies, including Target, Sears, Macy's, Sprint, T-Mobile and 14 of the 20 largest U.S. financial institutions, use its "knowledge-based authentication" (KBA) service and that it has a "false failure" rate (meaning folks flunking on erroneous public info) of less than 5%.
It did so by offering single sign-on, knowledge-based and multi-factor authentication options, which ensure that the right person signs the right document consistently.