匿

anonymity

anonymization (of data)

anonymous partnership

anonymity

concealment (esp. of wrongdoings or criminals)

anonymous shipping

to shelter a criminal

anonymous criticism

anonymous FTP

secret name

request to remain anonymous

privilege (e.g. "attorney-client privilege")

confidentiality

anonymous textboard

ad hoc group formed to commit crimes

(crime of) harboring a fugitive (harbouring)

concealed materials

hider

concealment

shelter

to shelter (e.g. a fugitive)

hiding

diving under cover and hiding