SkyECC Before the ECtHR: Norway Cases Expand the European Challenge to Encrypted Evidence

The European Court of Human Rights has now communicated another major set of cases concerning the use of encrypted communications evidence in criminal proceedings. In Isha and Emmen v. Norway, the Court addresses fundamental questions surrounding the use of SkyECC and EncroChat material obtained from French authorities and subsequently deployed in domestic prosecutions across Europe.

While the Norwegian proceedings themselves are significant, the broader importance of the cases lies elsewhere: the ECtHR is gradually building a coherent body of case law on the compatibility of large-scale encrypted communication investigations with the guarantees of Article 6 ECHR.

Taken together with the pending ECtHR proceedings in Silgir v. Germany (EncroChat) and Raal v. Estonia (ANOM), the communicated Norwegian cases may become part of the most consequential line of European criminal procedure jurisprudence in the digital era.

The ECtHR’s Expanding Encrypted Evidence Jurisprudence

Over the past years, encrypted communication platforms such as:

• EncroChat

• SkyECC

• ANOM

have fundamentally changed organised crime investigations across Europe.

At the same time, they have generated unprecedented legal questions concerning:

• cross-border surveillance,

• foreign evidence gathering,

• disclosure obligations,

• defence access to technical material,

• authenticity and integrity of digital evidence,

• and equality of arms in criminal proceedings.

  
  

The Strasbourg Court is now confronted with these questions simultaneously in multiple jurisdictions.

The Norwegian SkyECC cases therefore cannot be viewed in isolation. They form part of a broader European judicial reassessment of how courts should handle evidence derived from highly technical multinational interception operations.

From EncroChat to SkyECC: The Shift from Article 8 to Article 6

Earlier litigation concerning EncroChat primarily focused on the legality of the underlying interception measures conducted by French authorities and the subsequent transfer of data throughout Europe.

That discussion is now evolving into something broader.

The central issue increasingly before European courts is no longer merely whether the interception itself was lawful, but whether defendants can receive a fair trial when the evidence originates from opaque foreign technical operations that domestic courts are unable — or unwilling — to fully scrutinise.

That transition is visible in the Norwegian cases communicated by the ECtHR.

Importantly, the pending ECtHR proceedings in Silgir v. Germany (EncroChat) already placed the downstream domestic use of EncroChat evidence before the Strasbourg Court. The communicated Norwegian SkyECC proceedings now expand that discussion further by focusing directly on Article 6 implications arising from the use of encrypted communications evidence in criminal trials.

The Core Questions Asked by the ECtHR

The questions formulated by the Court are striking because they directly target the structural weaknesses repeatedly raised by defence teams across Europe in SkyECC, EncroChat, and ANOM proceedings.

The ECtHR asks, inter alia:

• whether the encrypted evidence was decisive for conviction,

• whether sufficient safeguards existed to verify integrity and authenticity,

• whether the defence had a genuine opportunity to challenge the material,

• whether the inability to examine the chain of custody created procedural inequality,

• whether domestic courts sufficiently assessed reliability,

• and whether complete datasets were transferred or merely selected extracts.

These are not merely technical side issues. They go to the heart of adversarial criminal procedure.

The “Black Box” Problem in European Criminal Proceedings

One issue increasingly emerging across all encrypted communication litigation is what many defence lawyers describe as the “black box” problem.

Domestic courts frequently receive encrypted communication evidence in packaged form from foreign authorities without access to:

• original interception infrastructure,

• forensic extraction methods,

• filtering procedures,

• source code,

• or the full communication environment.

In many cases, neither the defence nor the domestic courts themselves can independently verify:

• whether datasets are complete,

• whether messages are missing,

• whether attribution is accurate,

• or whether contextual information has been excluded.

The ECtHR now appears prepared to examine whether criminal convictions can legitimately rest on evidence that remains partially insulated from adversarial scrutiny.

The Importance of the Pending ANOM Cases Before the ECtHR

The significance of the Norwegian SkyECC communication becomes even clearer when viewed alongside the pending ANOM proceedings before the Strasbourg Court, most notably Raal v. Estonia (ANOM).

The ANOM cases raise similarly fundamental questions concerning:

• transnational covert operations,

• state involvement in encrypted communication platforms,

• evidentiary transparency,

• and defence access to operational material.

  
  

ANOM differs structurally from EncroChat and SkyECC because the platform itself was reportedly invented and operated in cooperation with law enforcement authorities. This creates additional questions concerning:

• investigative provocation,

• operational control,

• evidence generation,

• and disclosure obligations.

Despite these differences, the underlying Article 6 concerns overlap considerably:

• Can the defence effectively challenge the evidence?

• Can courts independently verify authenticity?

• Does judicial deference to foreign investigative measures undermine fair trial guarantees?

The ECtHR’s future reasoning across ANOM, EncroChat, and SkyECC cases will likely shape a unified European standard for encrypted evidence.

Why Silgir v. Germany Matters for All EncroChat and SkyECC Cases

Among the pending Strasbourg proceedings, Silgir v. Germany (EncroChat) is likely to become one of the defining decisions for the future treatment of encrypted communications evidence in Europe.

The case directly concerns the domestic use of EncroChat material within criminal proceedings and raises broader questions concerning:

• judicial review of foreign investigative measures,

• admissibility of bulk digital evidence,

• procedural equality,

• and the extent of disclosure obligations owed to the defence.

This is particularly relevant because many domestic courts throughout Europe have thus far relied heavily on principles of mutual trust between European states and have shown considerable reluctance to scrutinise investigative measures conducted abroad.

The Strasbourg Court now appears increasingly willing to examine whether such judicial deference has limits under Article 6 ECHR.

The future judgment in Silgir v. Germany may therefore become highly influential not only for EncroChat proceedings, but also for SkyECC and ANOM litigation throughout Europe.

A European Turning Point for Digital Criminal Evidence

The communicated Norwegian cases illustrate a broader transformation within European criminal procedure.

Historically, evidentiary disputes often concerned:

• witness credibility,

• physical evidence,

• or traditional surveillance.

Encrypted communication cases are fundamentally different.

The central disputes now concern:

• metadata,

• extraction environments,

• forensic reproducibility,

• data completeness,

• and technical transparency.

This creates procedural asymmetries rarely encountered in traditional criminal litigation.

The ECtHR therefore faces a defining question:

What level of transparency and verifiability is required before encrypted digital evidence can satisfy the requirements of a fair trial under Article 6 ECHR?

Conclusion

The communication of Isha and Emmen v. Norway demonstrates that the ECtHR is now directly confronting the fair trial implications of encrypted communication evidence obtained through multinational investigations.

Together with the pending proceedings in Silgir v. Germany (EncroChat) and Raal v. Estonia (ANOM), these cases may ultimately establish the first comprehensive Strasbourg framework governing:

• SkyECC evidence,

• EncroChat prosecutions,

• ANOM operations,

• and cross-border digital criminal evidence generally.

For defence practitioners across Europe, the implications are substantial. The Court’s future judgments may determine not only how encrypted evidence is assessed, but also how far European criminal justice systems may rely on evidence that neither courts nor defence teams can fully examine.