Chicago private equity firm Thoma Bravo is buying a majority stake in encryption software maker DigiCert from TA Associates for undisclosed terms.  TA Associates will retain a minority stake in DigiCert, which it acquired in 2012.

Lehi, Utah-based DigiCert, founded in 2003, makes authentication and encryption software for government agencies, financial institutions and technology companies, serving more than 115,000 customers across 180 counties. Some of DigiCert’s customers include Facebook Inc. (Nasdaq: FB), PayPal Holdings Inc. (Nasdaq: PYPL), Yahoo! Inc. (Nasdaq: YHOO) and International Business Machines Corp. (NYSE: IBM).

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