24 research outputs found
On Secure Workflow Decentralisation on the Internet
Decentralised workflow management systems are a new research area, where most
work to-date has focused on the system's overall architecture. As little
attention has been given to the security aspects in such systems, we follow a
security driven approach, and consider, from the perspective of available
security building blocks, how security can be implemented and what new
opportunities are presented when empowering the decentralised environment with
modern distributed security protocols. Our research is motivated by a more
general question of how to combine the positive enablers that email exchange
enjoys, with the general benefits of workflow systems, and more specifically
with the benefits that can be introduced in a decentralised environment. This
aims to equip email users with a set of tools to manage the semantics of a
message exchange, contents, participants and their roles in the exchange in an
environment that provides inherent assurances of security and privacy. This
work is based on a survey of contemporary distributed security protocols, and
considers how these protocols could be used in implementing a distributed
workflow management system with decentralised control . We review a set of
these protocols, focusing on the required message sequences in reviewing the
protocols, and discuss how these security protocols provide the foundations for
implementing core control-flow, data, and resource patterns in a distributed
workflow environment
RSA Security Home> RSA Laboratories> Tech Notes> TWIRL and RSA Key Size
The popular 1024-bit key size for RSA keys is becoming the next horizon for researchers in inte factorization, as demonstrated by the innovative “TWIRL ” design recently proposed by Adi Sham Tromer. The design confirms that the traditional assumption that a 1024-bit RSA key provides co strength to an 80-bit symmetric key has been a reasonable one. Thus, if the 80-bit security level appropriate for a given application, then TWIRL itself has no immediate effect. Many details rem worked out, however, and the cost estimates are inconclusive. TWIRL provides an opportunity f key sizes in practice; RSA Laboratories ’ revised recommendations are given in Table 1 below
An Analysis of Shamir’s Factoring Device
for an unusual piece of hardware. This hardware, called “TWINKLE ” (which stands for The Weizmann INstitute Key Locating Engine), is an electro-optical sieving device which will execute sieve-based factoring algorithms approximately two to three orders of magnitude as fast as a conventional fast PC. The announcement only presented a rough design, and there a number of practical difficulties involved with fabricating the device. It runs at a very high clock rate (10 GHz), must trigger LEDs at precise intervals of time, and uses wafer-scale technology. However, it is my opinion that the device is practical and could be built after some engineering effort is applied to it. Shamir estimates that the device can be fabricated (after the desig