Quantum threat intelligence, open to everyone

SQOUT® is a knowledge base of attacks on quantum communication systems, such as quantum key distribution (QKD), and of the countermeasures against them. This open-access site shows the public part of SQOUT. You can use it without an account.

Here you can:

browse the quantum threat matrix, which orders attack techniques by tactic,
read each attack technique and countermeasure, with the scientific papers behind it,
look up terms in the dictionary,
read new analysis on the blog.

Every item on this site is released for public use.

Study Corner

Technique

A-0067: Wavelength-Selected Photon-Number-Splitting Attack
Tactic: Execution
The Wavelength-Selected Photon-Number-Splitting (WSPNS) attack targets quantum key distribution systems using decoy states using a two-way scheme, exploiting the properties …
Read more

Countermeasure

CM-0038: Phase Modulator Triggering
Tactic: Harden
Triggering phase modulators with incoming bright light pulses to enhance QKD system security.
Read more

Knowledge Base Updates

Category	Total	New (30d)	Updated (30d)
Techniques	54	0	54
Countermeasures	57	0	57

View full knowledge base

What the full SQOUT platform adds

The full platform holds much more than this site. In October 2026, it covers 149 attack techniques, 132 vulnerabilities 194 countermeasures and 34 quantum protocols.

It also adds:

full technique details: feasibility, required equipment, and links to hardware, software and protocols,
vulnerabilities, products and threat actors,
QBuilder, to model your own quantum communication device adn QNetwork to model your quantum network,
QAnalyser, to find the weaknesses in that model automatically,
QKill, to model attacks in several steps and calculate the risk.

Would you like to see the full platform? Contact us for a demonstration.

Using SQOUT content? Please name SQOUT and link to the page you used. See the terms of use.