HSM Tamper Response for Multi-Tenant Attack Isolation
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Solution Overview
Problem
Multi-tenant Hardware Security Modules (HSMs) face challenges in detecting and isolating tamper conditions to diagnose the root cause of cryptographic attacks, leading to complex fraud detection and protection of sensitive cryptographic keys and PINs.
Innovation Solution
An electronic hardware sub-system within the HSM comprising a Main Processor (MP) and Sensor Processor (SP) with a Tamper Prevention System (TPS) for physical and logical attack detection, along with an HSM Manager for dynamic fraud analysis and isolation of affected API services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single HSM is shared by multiple customers in a Hardware-as-a-Service model, then resource utilization and service efficiency are improved, but the complexity of supporting and protecting multi-tenant applications against cryptographic attacks increases
Solution Approach 1:
The patent segments the HSM into multiple isolated tenant environments with separate cryptographic key stores, processing units, and security contexts. Each tenant operates in an isolated partition that prevents attacks from affecting other tenants, thereby enabling multi-tenant sharing while managing security complexity through structural division.
Solution Approach 2:
The patent introduces a tamper response manager as an intermediary component that monitors and manages security events across multiple tenants. This mediator coordinates fraud detection, isolates compromised tenants, and manages key destruction events, reducing the overall complexity of protecting multi-tenant applications by centralizing security management.
2Reliability
If fraud detection is implemented across multiple tenants on the same HSM, then security monitoring capability is improved, but the difficulty of detecting and measuring tamper conditions and isolating root causes increases
Solution Approach 1:
The patent implements segmented monitoring where each tenant has dedicated fraud detection capabilities and isolated security event logging. This segmentation allows the system to monitor multiple tenants simultaneously while making it easier to identify which specific tenant is experiencing tamper conditions, reducing the difficulty of detection and measurement.
Solution Approach 2:
The patent implements feedback mechanisms where the tamper response manager continuously monitors security events from each tenant and provides real-time responses. When tamper conditions are detected, the system feeds back isolation actions to specific tenants and tracks the effectiveness of these actions, making it easier to detect and measure tamper conditions through continuous monitoring and response validation.
3Reliability
If cryptographic keys are protected through isolation and key destruction upon tamper detection, then security against attacks is improved, but the loss of cryptographic material increases during security events
Solution Approach 1:
The patent segments cryptographic key storage into isolated tenant partitions, each with its own key store protected by separate security contexts. When tamper conditions are detected in one tenant partition, only the cryptographic keys in that specific partition are destroyed, while keys in other tenant partitions remain intact. This segmentation approach maintains high security against attacks while minimizing the loss of cryptographic material to only what is necessary for the compromised tenant.
Data Source
AI summary
Provided is an electronic hardware sub-system within a multi-tenant Hardware Security Module (HSM) for tamper response against physical and logical attacks against the HSM. An HSM Manager manages and orchestrates the vHSMs for dynamic fraud analysis by way of a Tamper Prevention System, wherein a Watchdog detects intrusions and declares Tamper Events, and a Tamper Enforcement Module signals HSM Actors about a tamper state action responsive to said Tamper Event and intrusions. Once enabled, it protects multi-tenant applications against cryptographic attacks and offers continuous fraud detection in a layered approach that intelligently detects a root cause of an attack and isolated an impacted area in a tenant partition. Other embodiments disclosed.