Gwendolen Morgan, of law firm Bindmans, representing Mr Miranda, said outside court that the Home Office and police had made "sweeping and vague assertions about national security".
She said Mr Miranda "does not accept the assertions they have made".
He "looks forward to the opportunity to have the Government's actions and assertions fully scrutinised" at the hearing in October, she added.
More top news
The scale of cyber crime is being underestimated because many cases are not reported to the police, according to the National Crime Agency.
Labour is set to call on MPs to put their support behind a "jobs first" Brexit in the final round of voting on the Queen's Speech.
A retired judge will lead the public inquiry into the Grenfell Tower disaster, sources have confirmed.