John Gould has resigned as vice president of electronic commerce at MasterCard International to become chief executive officer of Terisa Systems Inc., a specialist in security for Internet transactions.

Mr. Gould played a key role in developing the Secure Electronic Transactions protocol, known as SET. Terisa Systems, a spinoff of the data encryption company RSA Data Security Inc., also participated, with Visa International, Microsoft Corp., Netscape Communications Corp., and other major technology companies.

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