Mr Dacre said the UK had one of the "less liberal" systems for publishing official documents in Europe and any "unnecessary secrecy" risked increasing cynicism about government.
John Young, a New-York-based architect and political activist, was publishing secret intelligence documents on his enigmatic website when Julian Assange had yet to even drop out of college.
Several U.S. officials have asserted that Assange violated the law by publishing in 2010 and 2011 a trove of classified war documents and diplomatic cables.