hide somebody's identity
conceal somebody's identity

Davy Jones had removed the last living threat to his hidden identity!

On first appearances the unpromising surface seems reluctant to reveal its hidden identity.

Luke and Noah begin an on-and-off fight about Noah's hidden identity.

But in New Orleans, they are often a deeper statement: a hidden identity revealed, a message decorated with feathers and beads.

Safe passage and hidden identities would not protect their chosen leaders once they were inside Buckkeep's walls.

He is rarely known because of his hidden identity during his undercover missions of 1673.

While maintaining her hidden identity, Sarah was a good soldier.

Even in a silent room with only two corpses as witnesses, Number One was unwilling to reveal his hidden identity.

But it doesn't take long until her hidden identity is discovered and she gets thrown out of the Castle.

The true secret to his hidden identity was unknown to the four well-fed lieutenants who served him.