There are many possibilities for SJTU’s IP addresses being involved in the incident. Any assessments made about SJTU’s involvement at this point would be just a guess.

July 26, 2004
In response to accusations that the Chinese government was involved in computer intrusions against ROK government agencies
“Some media reports that the Chinese government might be behind the hacking incident are groundless” – Chinese Embassy in Seoul (no personal attribution)

December 15, 2005
Response to SANS comments about China being involved in world wide hacking
“Work units and individuals are not permitted to use the Internet to be engaged in illegal activities or commit crimes,… China has laws that make tampering with or cracking a computer’s code illegal.” – Qin Gang

August 27, 2007
In response to a Der Spiegel article that reported intrusions into the German governemnt
“The Chinese government attaches great importance to the hacker attack on the German government networks,” adding China would take “determined” and “forceful” measures to combat hacker activities. – Wen Jiabao

August 28, 2007
In response to the reports of Chinese attributed intrusions into the government of Germany
“The Chinese government has always opposed and prohibited any criminal activity that breaks down computer networks, including hacker attacks,… China has clear rules and regulations on this.” – Jiang Yu

September 4, 2007
In a public response to the FT article that suggested PRC government involvement in a Pentagon intrusion
“The Chinese government has always opposed any Internet-wrecking crime, including hacking, and cracked down on it according to the law” – An Lu (editor)

September 10, 2007
Response to reports about intrusions into the French government for which the French plainly stated that they have no evidence to indicate PRC gov involvement.
“Saying that the Chinese military has made cyber-attacks on the networks of foreign governments is groundless and irresponsible and are a result of ulterior motives” – Jiang Yu

April 9, 2008
In response to Business Week’s e-Spionage article
“The Chinese Government always opposes and forbids any cyber crimes including “hacking” that undermine the security of computer networks. Chinese laws and regulations are explicit in this regard.” – Wang Baodong

April 1, 2009
In response to Ghostnet report
“There is a ghost called the Cold War and a virus called the Theory of China’s Threat overseas,… Some people, possessed by this ghost and infected with this virus, ‘fall ill’ from time to time. Their attempts at using rumors to disgrace China will never succeed…  It is the ghost and the virus that should be ferreted out” - Qin Gang

May 15, 2009
Response to accusations of Chinese espionage in PACOM.
“We urge the United States to abandon Cold War mentality, stop its groundless accusations against China and do more to help build mutual trust between the United States and China and the friendship between the two peoples,” – Ma Zhaoxu
“The intrusion doesn’t exist at all” – Jiang Yu

Jun 12, 2008
In response to reports of Chinese hacking into computers in the offices of Rep. Frank Wolf and Rep. Chris Smith.
“Is there any evidence? … Do we have such advanced technology? Even I don’t believe it,… I’d like to urge some people in the U.S. not to be paranoid,… They should do more to contribute to mutual understanding, trust and friendship between the U.S. and China.” – Qin Gang

January 19, 2010
In response to Indian allegations of Chinese hacking (following the Google intrusion)
“I can say that these accusations are groundless… The Chinese government is firmly against hacking activities and will deal with relevant cases in accordance with the law” – Ma Zhaoxu

January 22, 2010
In response to US Sec of State Hillary Clinton’s remarks about Internet Freedom and the Google intrusion
“We urge the United States to respect the facts and cease using so-called Internet freedom to make groundless accusations against China” – Ma Zhaoxu
“China resolutely opposes Clinton’s remarks and it is not true that the country restricts online freedom…” – Ma Zhaoxu

January 25, 2010
In response to US Sec of State Clinton’s request for a transparent investigation into the Google intrusion
“We are resolutely against those who make a issue of things without referring to actual facts by needlessly accusing China, ignoring Chinese laws and interfering in Chinese internal politics” – unnamed spokesperson for the State Council Information Office

“As the global landscape is undergoing profound irreversible shifts, the calculated free-Internet scheme is just one step of a U.S. tactic to preserve its hegemonic domination” – Yan Xuetong

January 25, 2010
Response to Google intrusion
The “accusation that the Chinese government participated in (any) cyberattack, either in an explicit or inexplicit way, is groundless and aims to denigrate China… We are firmly opposed to that” – unnamed spokesman for the Ministry of Industry and Information Technology to Xinhua

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