The best replacement for confidentiality is privacy.

The best alternatives to confidentiality are rated as following:
★★★★★  privacy
★★★★  privilege
★★★★  anonymity
★★  integrity
★★  duty to warn
★  disclosure
★  non disclosure agreement
★  secrecy
★  right to know
★  solicitor client privilege
★  transparency
★  attorney client privilege
★  privileged communication
  duty to protect
  informed consent
  non disclosure
  duty of care
  non disclosure agreements
  hipaa
  non-disclosure
  attorney-client privilege
  authentication
  duty-to-warn
  privacy policy
  non-disclosure agreements
  privacy ethics
  non-disclosure agreement

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Speaking about confidentiality, one probably shouldn't forget about integrity.

Other search terms related to confidentiality and their ratings are:
★★★★★ integrity
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Google Trends

Scale is based on the average worldwide traffic of confidentiality in all years. Click on graph for more.
confidentiality
privacy
privilege