Quantum Exposure Index · IEQ

IEQ estimates the quantum exposure of your main domain.

It combines public cryptographic signals from the domain with a sector assumption: how long captured ciphertext may retain strategic value for an adversary.

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Quantum Exposure Index

IEQ

Public signals from the main domain, interpreted alongside sector assumptions.

Dataset and method

CollectionSeptember 2, 2026

Observed signalPublic TLS handshake

ScopeMain domain

Methodology

01 / 5

A copy made today may be read later.

In an HNDL scenario, an adversary may store encrypted traffic they manage to capture. The risk depends on whether that captured content still has strategic value to them when its encryption can be broken.

Understand Harvest-Now, Decrypt-Later ↗

Today

Traffic may be copied.

In the meantime

The encrypted copy is stored.

In the future

A cryptographically relevant computer may break the key exchange.

Harvest now, decrypt later (HNDL) scenario. The arrival date of this computer is uncertain; schematic, not to scale.

02 / 5

HNDL exposure combines public reach and key exchange vulnerability.

Public reach allows traffic to be observed and stored. An exchange vulnerable to Shor makes future key breaking possible. The diagram shows how these conditions combine in an HNDL scenario.

See what IEQ measures ↗

Public reach and key exchange resistance
	Resistant to Shor	Vulnerable to Shor
Not publicly reachable	Outside public reachThe service is not accessible on the public surface.	Outside public reachThe exchange is vulnerable, but the traffic is not accessible on the public surface.
Publicly reachable	Observable trafficThe traffic is externally reachable; the observed exchange is resistant to Shor.	Technical HNDL conditionThe traffic is externally reachable and the observed exchange is vulnerable to Shor.

The matrix shows technical potential, not confirmed capture. Public reach makes traffic observable; an exchange vulnerable to Shor may allow the key to be broken in the future. IEQ also uses a sector assumption about how long captured ciphertext would retain strategic value for an adversary.

03 / 5

The strategic value of captured content also matters.

HNDL matters if captured content still has strategic value to an adversary when a cryptographically relevant computer can break the key exchange in use.

Read: the confidentiality horizon is part of security ↗

TodayUncertain futureQ-Day

Medical record

decades

Stock price tip

days

These examples are schematic and do not represent timelines measured by IEQ. The band marks an uncertain future; the axis has no date scale.

04 / 5