Collocations for secrecy - noun

absolute, complete, total
great, strict, utmost
excessive
government, official

maintain
be cloaked in, be shrouded in
be sworn to
All the researchers on the project are sworn to absolute secrecy.

surround sth

in secrecy
The drugs squad operates in the greatest secrecy.

secrecy about
The organization has managed to maintain secrecy about its activities.

a blanket of secrecy, a cloak of secrecy, a veil of secrecy
A blanket of secrecy surrounded the tribunals.

a culture of secrecy (esp. BrE)
The Ministry of Defence must answer for its culture of secrecy.