Towards a Hybrid Public Key Infrastructure (PKI): A Review

Traditional Certificate-based public key infrastructure (PKI) suffers from the problem of certificate overhead like its storage, verification, revocation etc. To overcome these problems, the idea of certificate less identity-based public key cryptography (ID-PKC) was proposed by Shamir. This is suitable for closed trusted group only. Also, this concept has some inherent problems like key escrow problem, secure key channel problem, identity management overhead etc. Later on, there had been several works which tried to combine both the cryptographic techniques such that the resulting hybrid PKI framework is built upon the best features of both the cryptographic techniques. It had been shown that this approach solves many problems associated with an individual cryptosystem. In this paper, we have reviewed and compared such hybrid schemes which tried to combine both the certificate based PKC and ID-based PKC. Also, the summary of the comparison, based on various features, is presented in a table

Joint Observation of the Galactic Center with MAGIC and CTA-LST-1

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes (IACTs), designed to detect very-high-energy gamma rays, and is operating in stereoscopic mode since 2009 at the Observatorio del Roque de Los Muchachos in La Palma, Spain. In 2018, the prototype IACT of the Large-Sized Telescope (LST-1) for the Cherenkov Telescope Array, a next-generation ground-based gamma-ray observatory, was inaugurated at the same site, at a distance of approximately 100 meters from the MAGIC telescopes. Using joint observations between MAGIC and LST-1, we developed a dedicated analysis pipeline and established the threefold telescope system via software, achieving the highest sensitivity in the northern hemisphere. Based on this enhanced performance, MAGIC and LST-1 have been jointly and regularly observing the Galactic Center, a region of paramount importance and complexity for IACTs. In particular, the gamma-ray emission from the dynamical center of the Milky Way is under debate. Although previous measurements suggested that a supermassive black hole Sagittarius A* plays a primary role, its radiation mechanism remains unclear, mainly due to limited angular resolution and sensitivity. The enhanced sensitivity in our novel approach is thus expected to provide new insights into the question. We here present the current status of the data analysis for the Galactic Center joint MAGIC and LST-1 observations

MAGIC and H.E.S.S. detect VHE gamma rays from the blazar OT081 for the first time: a deep multiwavelength study

https://pos.sissa.it/395/815/pdfPublished versio

LST-1 observations of an enormous flare of BL Lacertae in 2021

International audienceThe first prototype of LST (LST-1) for the Cherenkov Telescope Array has been in commissioning phase since 2018 and already started scientific observations with the low energy threshold around a few tens of GeV. In 2021, LST-1 observed BL Lac following the alerts based on multi-wavelength observations and detected prominent gamma-ray flares. In addition to the daily flux variability, LST-1 also detected sub-hour-scale intra-night variability reaching 3–4 times higher than thegamma-ray flux from the Crab Nebula above 100 GeV. In this proceeding, we will report the analysis results of LST-1 observations of BL Lac in 2021, especially focusing on flux variability

LST-1 observations of an enormous flare of BL Lacertae in 2021

38th International Cosmic Ray Conference (ICRC2023), 26 July - 3 August, 2023, Nagoya, Japan.Seiya Nozaki, Katsuaki Asano, Juan Escudero, Gabriel Emery and Chaitanya Priyadarshi on behalf of the CTA-LST Project. Luis del Peral Gochicoa, Jose Julio Lozano Bahilo and Maria Dolores Rodriguez Frias belong to the CTA-LST Project.The first prototype of LST (LST-1) for the Cherenkov Telescope Array has been in commissioning phase since 2018 and already started scientific observations with the low energy threshold around a few tens of GeV. In 2021, LST-1 observed BL Lac following the alerts based on multi-wavelength observations and detected prominent gamma-ray flares. In addition to the daily flux variability, LST-1 also detected sub-hour-scale intra-night variability reaching 3–4 times higher than the gamma-ray flux from the Crab Nebula above 100 GeV. In this proceeding, we will report the analysis results of LST-1 observations of BL Lac in 2021, especially focusing on flux variability

cta-observatory/cta-lstchain: v0.10.5 - 2023-12-01

<h2>What's Changed</h2> <ul> <li>Add missing wild card in pedestal search function to allow looking for symlinks in glob (#1185) @FrancaCassol</li> <li>Estimate cleaning threshold with CatB pedestals if availables (#1143) @FrancaCassol</li> <li>Notebook for sensitivity calculation (#1158) @moralejo</li> <li>Update interpolation code to pyirf v0.10 API (#1184) @morcuended</li> <li>Remove unused <code>get_cleaning_parameters</code> function (#1170) @aaguasca</li> <li>Add possibility to copy and not merge some keys by lstchain_merge_hdf5_files (#1174) @FrancaCassol</li> <li>Add Cat-B calibration onsite scripts (#1147) @FrancaCassol</li> <li>Make run_summary script work with ctar1 data, store format string (#1179) @maxnoe</li> <li>Create script to merge run summaries with drive logs into a single file (#880) @maxnoe</li> <li>Get run type from TCU if it's available (#1173) @marialainez</li> <li>add default compression to write_dataframe function to compress dl2 (#1165) @vuillaut</li> <li>Change master to main to trigger docs deployment (#1169) @morcuended</li> <li>request ctaplot 0.6.4 to fix the seaborn style issue (#1167) @vuillaut</li> <li>Update links to ctapipe docs in README (#1162) @morcuended</li> <li>Pin matplotlib to 3.7.0 to avoid setting deprecated seaborn styles in matplotlib 3.8 (#1166) @morcuended</li> <li>Write modified images from dl1ab in output DL1 files and fix <code>add_config_metadata</code> (#1145) @vuillaut</li> <li>Updated run_type in summary test (#1156) @morcuended</li> <li>Fix treatment of Nan values in filter scan fit (#1153) @FrancaCassol</li> </ul> <h2>Contributers</h2> <p>@FrancaCassol, @aaguasca, @marialainez, @maxnoe, @moralejo, @morcuended, @rlopezcoto and @vuillaut</p&gt

lstchain: An Analysis Pipeline for LST-1, the First Prototype Large-Sized Telescope of CTA

International audienceThe future Cherenkov Telescope Array (CTA) will have telescopes of different sizes, the Large-Sized Telescopes (LSTs) being the largest ones. Located on the island of La Palma, the LST-1, the prototype of the first LST, started taking astronomical data in November 2019, detecting the first gamma-ray sources right afterwards. The analysis pipeline, that processes data from raw inputs until high level products is called lstchain and is heavily based in the CTA prototype pipeline framework ctapipe. In this presentation I'll show the pipeline that performs signal integration, image cleaning, image parameter calculation, and machine learning methods for true parameter reconstruction

lstchain: An Analysis Pipeline for LST-1, the First Prototype Large-Sized Telescope of CTA

International audienceThe future Cherenkov Telescope Array (CTA) will have telescopes of different sizes, the Large-Sized Telescopes (LSTs) being the largest ones. Located on the island of La Palma, the LST-1, the prototype of the first LST, started taking astronomical data in November 2019, detecting the first gamma-ray sources right afterwards. The analysis pipeline, that processes data from raw inputs until high level products is called lstchain and is heavily based in the CTA prototype pipeline framework ctapipe. In this presentation I'll show the pipeline that performs signal integration, image cleaning, image parameter calculation, and machine learning methods for true parameter reconstruction