From PhysOrg:

In a pair of experiments that raise questions about the use of national identifying numbers, Harvard researchers have shown that Resident Registration Numbers (RRN) used in South Korea can be decrypted to reveal a host of personal information.

Led by Professor of Government and Technology in Residence Latanya Sweeney, a team of researchers in two experiments was able to decrypt more than 23,000 RRNs using both computation and logical reasoning. The findings suggest that, while such identifiers are encrypted to protect privacy, they remain vulnerable to attack and must be designed to avoid such weaknesses. The studies are described in a September 29 paper published in Technology Science.

“Like most data driven highly networked societies, South Korea uses personally identifying numbers as a linchpin to personal identity in employment, banking, taxation, and for social and medical services. In the United States, we use Social Security numbers similarly. When these numbers become easily accessible to others, whether through breaches or poor encryption in data sold or given away, the major institutions that rely on them become vulnerable. “

Sweeney and Ji Su Yoo, a Research Assistant at the Data Privacy Lab at Harvard and an author of the study, were able to show that each number in the RRN could be replaced with a letter in a recognizable pattern. Using such a pattern, they were able to decrypt thousands of RRNs that could uncover personal information about their users.

They also found that, like credit cards, the final digit is…

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