Silent Circle, a Geneva-based pioneer in the field of securing mobile communications, said on Friday that it has raised $50 million in a Series C financing round led by Santander Bank.

The firm, which was founded by well-known cryptologists in 2011, said it plans to use the funds to expand development of software products aimed at businesses, governments and law enforcement agencies, a shift from an early focus on individual consumers.

Silent Circle launched an app for encrypting mobile communications in 2012 and a highly secure device known as the Blackphone in 2013 to much fanfare from privacy advocates, but the products had limited commercial success.

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