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By Joseph Menn and Yeganeh Torbati SAN FRANCISCO/WASHINGTON (Reuters) – Iranian hackers have compromised more than a dozen accounts on the Telegram instant messaging service and identified the phone numbers of 15 million Iranian users, the largest known breach of the encrypted communications system, cyber researchers told Reuters. The attacks, which took place this year and have not been previously reported, jeopardized the communications of activists, journalists and other people in sensitive positions in Iran, where Telegram is used by some 20 million people, said independent cyber researcher Collin Anderson and Amnesty International technologist Claudio Guarnieri, who have been studying Iranian hacking groups for three years. Telegram promotes itself as an ultra secure instant messaging system because all data is encrypted from start to finish, known in the industry as end-to-end encryption.

By Joseph Menn SAN FRANCISCO (Reuters) – Juniper Networks Inc said late on Friday it would stop using a piece of security code that analysts believe was developed by the National Security Agency in order to eavesdrop through technology products. The Silicon Valley maker of networking gear said it would ship new versions of security software in the first half of this year to replace those that rely on numbers generated by Dual Elliptic Curve technology. The statement on a blog post came a day after the presentation at a Stanford University conference of research by a team of cryptographers who found that Juniper's code had been changed in multiple ways during 2008 to enable eavesdropping on virtual private network sessions by customers.

By Joseph Menn SAN FRANCISCO (Reuters) – Beginning more than a decade ago, one of the largest security companies in the world, Moscow-based Kaspersky Lab, tried to damage rivals in the marketplace by tricking their antivirus software programs into classifying benign files as malicious, according to two former employees. Some of the attacks were ordered by Kaspersky Lab's co-founder, Eugene Kaspersky, in part to retaliate against smaller rivals that he felt were aping his software instead of developing their own technology, they said. “Eugene considered this stealing,” said one of the former employees.

By Arshad Mohammed and Joseph Menn WASHINGTON (Reuters) – When a retired 51-year-old military man disclosed in a U.S. security clearance application that he had a 20-year affair with his former college roommate's wife, it was supposed to remain a secret between him and the government. The disclosure last week that hackers had penetrated a database containing such intimate and possibly damaging facts about millions of government and private employees has shaken Washington. The hacking of the White House Office of Personnel Management (OPM) could provide a treasure trove for foreign spies.

By Joseph Menn SAN FRANCISCO (Reuters) – The U.S. National Security Agency has figured out how to hide spying software deep within hard drives made by Western Digital, Seagate, Toshiba and other top manufacturers, giving the agency the means to eavesdrop on the majority of the world's computers, according to cyber researchers and former operatives. Kaspersky said it found personal computers in 30 countries infected with one or more of the spying programs, with the most infections seen in Iran, followed by Russia, Pakistan, Afghanistan, China, Mali, Syria, Yemen and Algeria. The targets included government and military institutions, telecommunication companies, banks, energy companies, nuclear researchers, media, and Islamic activists, Kaspersky said.