14,190 research outputs found
Sharing Computer Network Logs for Security and Privacy: A Motivation for New Methodologies of Anonymization
Logs are one of the most fundamental resources to any security professional.
It is widely recognized by the government and industry that it is both
beneficial and desirable to share logs for the purpose of security research.
However, the sharing is not happening or not to the degree or magnitude that is
desired. Organizations are reluctant to share logs because of the risk of
exposing sensitive information to potential attackers. We believe this
reluctance remains high because current anonymization techniques are weak and
one-size-fits-all--or better put, one size tries to fit all. We must develop
standards and make anonymization available at varying levels, striking a
balance between privacy and utility. Organizations have different needs and
trust other organizations to different degrees. They must be able to map
multiple anonymization levels with defined risks to the trust levels they share
with (would-be) receivers. It is not until there are industry standards for
multiple levels of anonymization that we will be able to move forward and
achieve the goal of widespread sharing of logs for security researchers.Comment: 17 pages, 1 figur
Monochromatic Gamma Rays from Dark Matter Annihilation to Leptons
We investigate the relation between the annihilation of dark matter (DM)
particles into lepton pairs and into 2-body final states including one or two
photons. We parametrize the DM interactions with leptons in terms of contact
interactions, and calculate the loop-level annihilation into monochromatic
gamma rays, specifically computing the ratio of the DM annihilation cross
sections into two gamma rays versus lepton pairs. While the loop-level
processes are generically suppressed in comparison with the tree-level
annihilation into leptons, we find that some choices for the mediator spin and
coupling structure lead to large branching fractions into gamma-ray lines. This
result has implications for a dark matter contribution to the AMS-02 positron
excess. We also explore the possibility of mediators which are charged under a
dark symmetry and find that, for these loop-level processes, an effective field
theory description is accurate for DM masses up to about half the mediator
mass.Comment: 21 pages plus appendices, 7 figures. v2: added experimental
constraints from CMB and Fermi, expanded and reorganized discussion
throughout. Accepted by JHE
The Continuing Search for a Meaningful Model of Judicial Rankings and Why It (Unfortunately) Matters
Automated acoustic intensity measurements and the effect of gear tooth profile on noise
Acoustic intensity measurements were made at NASA Lewis Research Center on a spur gear test apparatus. The measurements were obtained with the Robotic Acoustic Intensity Measurement System developed by Cleveland State University. This system provided dense spatial positioning, and was calibrated against a high quality acoustic intensity system. The measured gear noise compared gearsets having two different tooth profiles. The tests evaluated the sound field of the different gears for two speeds and three loads. The experimental results showed that gear tooth profile had a major effect on measured noise. Load and speed were found to have an effect on noise also
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