The 30-year-old hacker from Holon, who wished to remain anonymous, said he was concerned with Israel's poor PR efforts and decided to make a contribution of his own.
"The real war today is online. I spent an entire week exploring the site, a few hours each night, until I succeeded," he said.
The hacker added that he was surprised to learn that IHH received some 9,000 euros in donations every hour via the website. The group is planning to send a second flotilla to Gaza next month.
'Yes, we can'
However, the Holon hacker chose not to completely disable the website, but rather, inserted new content into it. For example, he replaced a large photo of the Marmara vessel with an image of an Israeli fighter jet, and a caption which read: "Yes, we can."
He also planted photos of the IDF's rescue unit helping earthquake victims in Turkey, as well as pictures showing Israeli leaders signing peace accords with Arab states on the White House lawn.
"I wanted to convey the message that Israel seeks peace," he said.
After four hours, the website's administrators finally managed to circumvent the online attack and restore the site's regular operations.