Paper 2026/1046

AWARE: A Non-Interactive Anonymous Whistleblowing System against Recipient Corruption

Abstract

Anonymous whistleblowing systems allow insiders to report organizational misconduct while preserving confidentiality and anonymity. Existing systems often use Tor-based submission and encryption under a recipient public key, so the mailbox does not learn the submitter’s network address or report contents. This protection does not remove reliance on the parties that authenticate insiders or open reports. Two corruption risks remain: (1) token-issuance records held by an authentication server can be correlated with a submission to link the report to a registered insider; and (2) a recipient with unilateral plaintext access may suppress, selectively disclose, or influence the report before any accountable opening process. We present AWARE, a non-interactive whistleblowing protocol for anonymous report submission by eligible insiders and threshold opening of reports. AWARE separates identity authentication from submission: after scheduled token refresh, an eligible insider can submit a report with a locally finalized token, without contacting the authentication server at submission time. AWARE also replaces single-recipient opening with committee threshold opening: report recovery requires a threshold of committee decryption shares that pass verification. Under the stated corruption and leakage assumptions, we prove the corresponding anonymity, token unforgeability, report confidentiality before opening, and opening integrity properties. A Java implementation shows practical costs in the tested settings.