While retailers battle breaches that have resulted in tens of millions of credit card numbers stolen, word comes from the RSA Conference in San Francisco that a major vendor of payment terminals has been shipping devices for over two decades with the same default password.

The vendor wasn't named by the researchers, David Byrne and Charles Henderson, but they did disclose the password: 166816.

A Google search reveals that's the default password for several models of credit card terminal sold by Verifone, a Silicon Valley-based vendor that says it connects 27 million payment devices and has operations in 150 countries.

Verifone didn't immediately comment on the claim.

The researchers said that the password remains in use on nine out of ten terminals they see from the vendor, in part because customers mistakenly assume it is unique to them.

The RSA Conference is a major annual event for the security industry and the comments of the two researchers were reported by The Register and SC Magazine.

Such conferences are often used to highlight poor security practices or disclose how hackers are targeting systems. The hope is that by making such information more widely known, companies and users will be more alert to cybersecurity and change bad habits.