CONFLLVM: A Compiler for Enforcing Data Confidentiality in Low-Level Code

We present an instrumenting compiler for enforcing data confidentiality in low-level applications (e.g. those written in C) in the presence of an active adversary. In our approach, the programmer marks secret data by writing lightweight annotations on top-level definitions in the source code. The compiler then uses a static flow analysis coupled with efficient runtime instrumentation, a custom memory layout, and custom control-flow integrity checks to prevent data leaks even in the presence of low-level attacks. We have implemented our scheme as part of the LLVM compiler. We evaluate it on the SPEC micro-benchmarks for performance, and on larger, real-world applications (including OpenLDAP, which is around 300KLoC) for programmer overhead required to restructure the application when protecting the sensitive data such as passwords. We find that performance overheads introduced by our instrumentation are moderate (average 12% on SPEC), and the programmer effort to port OpenLDAP is only about 160 LoC.Comment: Technical report for CONFLLVM: A Compiler for Enforcing Data Confidentiality in Low-Level Code, appearing at EuroSys 201

An Instrumenting Compiler for Enforcing Confidentiality in Low-Level Code

We present an instrumenting compiler for enforcing data confidentiality in low-level applications (e.g. those written in C) in the presence of an active adversary. In our approach, the programmer marks secret data by writing lightweight annotations on top-level definitions in the source code. The compiler then uses a static flow analysis coupled with efficient runtime instrumentation, a custom memory layout, and custom control-flow integrity checks to prevent data leaks even in the presence of low-level attacks. We have implemented our scheme as part of the LLVM compiler. We evaluate it on the SPEC micro-benchmarks for performance, and on larger, real-world applications (including OpenLDAP, which is around 300KLoC) for programmer overhead required to restructure the application when protecting the sensitive data such as passwords. We find that performance overheads introduced by our instrumentation are moderate (average 12% on SPEC), and the programmer effort to port OpenLDAP is only about 160 LoC

A STUDY OF OUTCOME OF ROSE K LENSES IN KERATOCONUS

Background: Cornea is affected by several distinct disorders that produce marked thinning without significant inflammation. They are keratoconus, posterior keratoconus, pellucid marginal degeneration, and keratoglobus. keratoconus and posterior keratoconus produces central and inferior thinning with ectasia. Materials and Methods: All patients of keratoconus in age group 15 to 60 years at various stages of progression were included this was a prospective study, 20 Eyes of 15 patients of keratoconus in age group of 15 to 60 years at various stages of progression were included in the study. Visual acuity, slit lamp Biomicroscopy was done, corneal topography and Fundus examination was done by both direct and indirect ophthalmoscopy with full dilatation when possible. Results: Subjective score of pre rose k eyes when compared to post rose k lens eye was highly significant, which signifies that the same patient was highly satisfied after wearing rose k lens. Conclusion: Present study observed that, Rose K lenses improved patient\u27s overall quality of life in moderate and advance cases of keratoconus. KEYWORDS: Keratoconus; Pellucid marginal degeneration; Keratoglobus; rose k lenses

A STUDY OF OUTCOME OF ROSE K LENSES IN KERATOCONUS

Background: Cornea is affected by several distinct disorders that produce marked thinning without significant inflammation. They are keratoconus, posterior keratoconus, pellucid marginal degeneration, and keratoglobus. keratoconus and posterior keratoconus produces central and inferior thinning with ectasia. Materials and Methods: All patients of keratoconus in age group 15 to 60 years at various stages of progression were included this was a prospective study, 20 Eyes of 15 patients of keratoconus in age group of 15 to 60 years at various stages of progression were included in the study. Visual acuity, slit lamp Biomicroscopy was done, corneal topography and Fundus examination was done by both direct and indirect ophthalmoscopy with full dilatation when possible. Results: Subjective score of pre rose k eyes when compared to post rose k lens eye was highly significant, which signifies that the same patient was highly satisfied after wearing rose k lens. Conclusion: Present study observed that, Rose K lenses improved patient's overall quality of life in moderate and advance cases of keratoconus. KEYWORDS: Keratoconus; Pellucid marginal degeneration; Keratoglobus; rose k lenses

IL-2 and IL-6 cooperate to enhance the generation of influenza-specific CD8 T cells responding to live influenza virus in aged mice and humans

An age-related decline in cytolytic activity has been described in CD8+ T cells and we have previously shown that the poor CD8+ effector T cell responses to influenza A/H3N2 challenge result from a decline in the proportion and function of these cytolytic T lymphocytes (CTL). Here, we describe that addition of exogenous cytokines to influenza-stimulated PBMC from both aged mice and humans, enhances the generation of influenza specific CD8 CTL by increasing their proliferation and survival. Our data show that the addition of IL-2 and IL-6 to splenocytes from mice previously infected with influenza virus restores the aged CD8+ T cell response to that observed in young mice. In humans, IL-2 plus IL-6 also reduces the proportion of apoptotic effector CD8+ T cells to levels resembling those of younger adults. In HLA-A2+ donors, MHC Class I tetramer staining showed that adding both exogenous IL-2 and IL-6 resulted in greater differentiation into influenza-specific effector CD8+ T cells. Since this effect of IL-2/IL-6 supplementation can be reproduced with the addition of Toll-like receptor agonists, it may be possible to exploit this mechanism and design new vaccines to improve the CD8 T cell response to influenza vaccination in older adults

LWIR: LTE-WLAN Integration at RLC Layer with Virtual WLAN Scheduler for Efficient Aggregation

LTE-WLAN Aggregation (LWA) at Radio Access Network (RAN) level offers better performance compared to other WLAN inter-working and offloading mechanisms due to its tighter integration. In rel.~13, 3GPP standardized an LWA architecture which works at the Packet Data Convergence Protocol (PDCP) layer of LTE eNodeB and provides packet-level steering. But this architecture provides sub-optimal performance because of various delays incurred on both sender (eNodeB) and receiver (UE) sides. To overcome this, we propose a new architecture LTE-WLAN integration at RLC Layer (LWIR) which works at the Radio Link Control (RLC) layer of LTE eNodeB. Along with this, Virtual WLAN Scheduler (VWS) which employs traffic steering scheme has been proposed. The VWS minimizes waiting time on Wi-Fi queue and thereby reduces out-of-order delivery at the UE side. Five different bearer selection schemes have also been proposed which provide efficient steering by smartly choosing a bearer to route some data onto Wi-Fi based on available bandwidth of Wi-Fi link. The VWS also contains an LTE feedback mechanism which coordinates with the LTE scheduler to ensure fairness as well as better utilization of system capacity. The evaluation considers collocated scenario in which LTE small cell (SeNB) and Wi-Fi Access Point (AP) are tightly integrated in LWIR node. We show that the proposed LWIR with VWS increases throughput up to 85\% when compared to LWA based packet-level steering