The call was coming from inside the company. Or so it seemed when the mobile phone of a customer-service representative for Robinhood Markets Inc. lit up on the evening of Nov. 3. More than an hour passed -- on and on the conversation ran, as the caller reeled in the hapless employee. By the time it was over, that one Robinhood rep had unwittingly handed over keys to the personal information of about 7 million customers, in what’s now believed to be one of the biggest retail brokerage cyber-breaches of all time, by number of accounts affected. Robinhood didn’t learn of the lapse until the rep got home and told a ... (full story)