A computer hacker testified on Wednesday that a News Corp unit hired him to develop pirating software, but denied using it to penetrate the security system of a rival satellite television service. Christopher Tarnovsky — who said his first payment was $20,000 in cash hidden in electronic devices mailed from Canada — testified in a corporate-spying lawsuit brought against News Corp’s NDS Groupby DISH Network Corp. The trial could result in hundreds of millions of dollars in damage awards. NDS, which provides security technology to a global satellite network that includes satellite TV service DirecTV, denies the claims, saying it was only engaged in reverse engineering — looking at a technology product to determine how it works, a standard in the electronics industry.