How chain-of-custody hashing resists tampering

In many breach scenarios, the first action an attacker takes is to clear logs or disable auditing services. If the logs are stored on the same server, they are easily manipulated. AncileBase prevents this by implementing on-host log chain-of-custody hashing.

Security audits are useless if the historical record cannot be trusted. If an attacker gains privileged access, the local `/var/log` system can be wiped or modified in seconds. Traditional solutions attempt to stream logs off-host immediately, but this leaves a vulnerability window during network outages.

Cryptographic Hashing Chains

As events are captured, they are cryptographically chained together (H_n = Hash(Event_n + H_n-1)). The current block hash is immediately shared with the central coordinator. If an attacker attempts to delete or alter past events, the hash chain breaks instantly, triggering a P1 Log Tampering alert.

By checking hashes continuously, the coordinator maintains math-backed proof of integrity. Because hash tokens are linked to chronological timestamps, any missing sequence is flagged immediately, identifying exactly when the disruption occurred.

Security at the Kernel Level

Because the eBPF probe runs in kernel space, it remains invisible to user-space root exploits. Even if an attacker gains root privileges, they cannot alter the kernel-space event queue without triggering an immediate hardware reset signature.

The kernel isolates eBPF memory maps from standard process memory. This means user-space processes, regardless of privilege levels, cannot write to or alter the historical cache maps, ensuring an immutable record.

Zero-Trust Logging Architecture

This cryptographic design forms the basis of our zero-trust infrastructure logging. We assume the host server is compromised. By securing the data structure mathematically at the boundary, we guarantee audit compliance under any failure scenario.