RERUM at 2nd Open NESSoS / EIT ICT Labs Workshop on Smart Grid Security

Henrich C. Pöhls will present the results of his joint work with Markus Karwe from University of Freiburg on Redactable Signatures to Control the Maximum Noise for Differential Privacy in the Smart Grid.

The Smart Grid is currently developed and fundamental security requirements like integrity and origin authentication need to be addressed while minimising arising privacy issues. This paper balances the opposing goals: On one hand, we mitigate privacy issues raised by overly precise energy consumption values via data perturbation mechanisms, e.g., add noise. On the other hand the paper describes how to limit the noise’s range and keep a verifiable level of integrity of consumption values from the Smart Metering Gateway by facilitating a redactable signature.

The second Open NESSoS / EIT ICT Labs Workshop on Smart Grid Security will take place in the Technical University of Munich, in the centre of the city, on the 26th of Feb, 2014 in the context of the International Symposium on Engineering Secure Software and Systems (ESSoS’14). The Workshop is sponsored jointly by the Network of Excellence on Engineering Secure Future Internet SW (NESSoS) and the action line smart energy systems of the EIT ICT Labs.

For an up-to-date list of RERUM’s academic publications including DOI links, please visit the papers page.


Henrich C. Pöhls will present the results of the joint work with Hermann de Meer Joachim Posegga and Kai Samelin at the International Symposium on Engineering Secure Software and Systems (ESSOS 2014).

ESSOS 2014 takes place in Munich from 26th till 28th of February 2014

These are first results that we obtained during the work in RERUM. We rigorously prove that RSSs are less expressive than SSSs: no unforgeable RSS can be transformed into an SSS. For the opposite direction we give a black-box transformation of a single SSS, with tightened security, into an RSS.
Redactable signatures (RSS) and sanitizable signatures (SSS) are among the most well studied cryptographic constructions of so called Malleable signature schemes (MSS).
Malleable signature schemes (MSS) enable a third party to alter signed data in a controlled way, maintaining a valid signature after an authorised change.
RSSs allow the removal of blocks from a signed document, while SSSs allow changing blocks to arbitrary strings.

This paper presents a method to transform a single instantiation of an SSS into an RSS. In detail, if we use one SSS instantiation, an emulation of an RSS can only be achieved, if the SSS’s security is strengthened, raising it above the existing standard. The resulting emulated RSS offers only weaker privacy guarantees. Moreover, we have argued rigorously that the opposite implication is not possible. Thus, no RSS can be transformed into an unforgeable SSS. Hence, RSSs and SSSs are indeed two different cryptographic building blocks, even if they achieve to define and delegate authorised modifications of signed messages. Currently, the number of SSSs achieving the new security requirements needed to securely emulate an RSS is still low.
For the future, we suggest to focus on implementing and standardising an SSS secure enough to emulate RSSs, to have one universal building block. In the meantime we advice to use dedicated RSS algorithms if only redactions are needed and a SSS algorithm. Of course, you are advised to check current work to ensure the cryptographic strength of the constructions.

For an up-to-date list of RERUM’s academic publications including DOI links, please visit the papers page.

Pre-FIA Workshop

RERUM is co-organizing a pre-FIA workshop together with 3 new IERC projects: VITAL, CityPulse and COSMOS. The workshop explores the concept of “IoT as a proponent of new Business Models and Social Engagement in Smart Cities” and includes both keynote presentations and panel discussions, encouraging also the participation of the audience in the discussions through Q&As.

The workshop will take place on Monday March 17th from 09.30 to 13.00. A draft agenda of the workshop is available at

Registration is open. Please register through the FIA event:

RERUM at PerCity 2014

RERUM consortium members recently wrote a paper entitled “Enabling Reliable and Secure IoT-based Smart City Applications”. This paper has been accepted for publication in the proceedings of the 1st International IEEE Workshop on Pervasive Systems for Smart Cities (PerCity).

The workshop will take place in Budapest and is organised in conjunction with the 12th IEEE International Conference on Pervasive Computing and Communications (PerCom 2014).

For an up-to-date list of RERUM’s academic publications including DOI links, please visit the papers page.

2nd RERUM Meeting in Munich – Presentation on COMPOSE

RERUM’s 2nd meeting took place in Siemens AG’s offices in Munich on December 9th and 10th, with very strong attendance from all partners.

During the meeting, there was also a presentation given to us by University of Passau’s Daniel Schreckling on the COMPOSE project’s security architecture. We found that COMPOSE and RERUM have a host of complementary elements and, as a result, Daniel’s seminar talk was followed by very lengthy and interesting discussion!

Many thanks to Daniel and COMPOSE for taking the time to come and talk to us.

RERUM has Started

REliable, Resilient and secUre IoT for sMart city applications

RERUM is a 3-year FP7 project funded by the EU under the FP7-SMARTCITIES-2013 programme. The project involves 12 partners and spans 6 European countries. Click here to visit RERUM’s page on CORDIS.

The project started on the 1st September 2013 and has a total cost of €5,196,176.00

RERUM will develop, evaluate, and trial an architectural framework for dependable, reliable, and secure networks of heterogeneous smart objects supporting innovative Smart City applications. The framework will be based on the concept of “security and privacy by design”, addressing the most critical factors for the success of Smart City applications.

You can read more about the project’s Aims and Objectives in the About page, while the Consortium page summarises information about the participants.

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Kick-Off Meeting

RERUM’s consortium members are excited to announce the start of this project.

The kick-off meeting took place on September 23rd-25th at Eurescom’s offices in Heidelberg, with over 15 attendees.