Verisign, which has pared down the company over the last year, has seen another CEO change: William Roper, who had been president and CEO for a bit more than a year, has resigned and the company board has named Jim Bidzos as interim CEO, president and executive chairman. Bidzos was the company’s founder and first CEO in 1995, and he tried to reassure analysts Thursday that he had the background to step into the role and quickly move forward, WSJ reports.

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No specific reasons were given for Roper’s departure. He was appointed CEO in May 2007 after previous CEO Stratton Sclavos stepped down for undisclosed reasons. Bidzos said the company expects to have sold most of its non-core businesses on schedule by the end this year. Among the biggest unit yet to be sold include its communications division, which focuses on telecoms routing technologies, and a unit that processes billing transactions for wireless providers. It sold off its CDN Kontki to MK Capital in April for a paltry $1 million plus stake in the new business. Wonder what will happen to its mobile content business Jamba, in which it owns 49 percent, with the rest being owned by News Corp…