Which preposition to use with anonymous

as Occurrences 2%

Pauline is the recipient of the confessions: the hero is as anonymous as the author, and this is no matter, for poet is the title both of the one and the other.

for Occurrences 1%

and Henry de Guise, and it remained anonymous for some time.

to Occurrences 1%

On the whole it may be said that the change from anonymous to signed articles has followed the course of most changes.

with Occurrences 1%

In Italy, prevention is anonymous with arrest.

Which preposition to use with  anonymous