Security hardening: #526
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…ecure-by-default TLS Phase 1+2 - Centralized secret redaction in logs: - Promote ConnectionStringRedactor to public with MaskKey/MaskPassword/RedactConnectionString - Mask keys (first 4 chars + x), passwords (first+last + x), conn-string secrets at all log sites - Batch SAS token no longer logged (storage account name only); KeyVault logs exception type/message Phase 3 - Strengthen settings-file encryption (Cryptography.cs): - New authenticated format: version byte + random salt + random IV + ciphertext + HMAC - PBKDF2-SHA256 100k iterations, encrypt-then-MAC; legacy read path retained for backward compat Phase 4 - TLS secure-by-default: - New --trustservercertificate/--trustcert flag (default false); certs validated by default - Added to settings JSON (AuthenticationArgs) and documented in CHANGELOG/README/commandline.md - Process-wide ambient default ConnectionHelper.TrustServerCertificate seeded by the binder; connData carries the operator's intent through the threaded build, validation, and backout paths Docs: CHANGELOG, README Security section, commandline.md flag reference. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Phase 1+2 - Centralized secret redaction in logs:
Phase 3 - Strengthen settings-file encryption (Cryptography.cs):
Phase 4 - TLS secure-by-default:
Docs: CHANGELOG, README Security section, commandline.md flag reference.