Best Effort and Practice Activation Codes

Activation Codes are used in many different digital services and known by many different names including voucher, e-coupon and discount code. In this paper we focus on a specific class of ACs that are short, human-readable, fixed-length and represent value. Even though this class of codes is extensively used there are no general guidelines for the design of Activation Code schemes. We discuss different methods that are used in practice and propose BEPAC, a new Activation Code scheme that provides both authenticity and confidentiality. The small message space of activation codes introduces some problems that are illustrated by an adaptive chosen-plaintext attack (CPA-2) on a general 3-round Feis- tel network of size 2^(2n) . This attack recovers the complete permutation from at most 2^(n+2) plaintext-ciphertext pairs. For this reason, BEPAC is designed in such a way that authenticity and confidentiality are in- dependent properties, i.e. loss of confidentiality does not imply loss of authenticity.Comment: 15 pages, 3 figures, TrustBus 201

The Malawi Agricultural Input Subsidy Programme: 2005-6 to 2008-9

Malawi’s implementation of a large scale agricultural input subsidy programme in 2005/6 and subsequent years has attracted significant international interest. This paper reviews the background, processes, achievements and outcomes of the programme over the period 2005/6 to 2008/9. The very large scale disbursement of heavily subsidised fertilisers and (mainly hybrid and composite maize) seed to very large numbers of beneficiaries across the country represents a significant logistical achievement and led to significant increases in national maize production and productivity, and this has contributed to increased food availability, higher real wages and wider economic growth and poverty reduction. However the latter years of the programme have also been accompanied by very high international fertilizer prices and costs and by high maize prices, the latter undermining the programme’s food security, poverty reduction and growth benefits for the majority of Malawian farmers, who are very poor and rely on purchased maize for significant amounts of their staple food requirements. Estimated economic returns to the programme have been satisfactory, given other benefits of the programme not captured in cost benefit analysis. With substantial reductions in both prices and subsidised volumes of fertilisers in subsequent years, there is considerable scope for building on achievements to substantially raise programme effectiveness, efficiency and benefits. Any application of Malawi’s subsidy experience to other countries needs to take account of special characteristics of the Malawian maize economy and of measures needed to raise such programmes’ effectiveness and efficiency and ensure their best fit with and contribution to sustainable development policies

Prescriptions for Produce: An intervention with nutrition education, cooking instruction and produce vouchers to increase fruit and vegetable consumption.

In this pilot study, we evaluated the feasibility of nutrition education, cooking instruction and produce vouchers for pregnant low income mothers to increase fruit and vegetable consumption. Participants were first trimester pregnant mothers receiving prenatal care at a local Federally Qualified Health Clinic (FQHC) in San Antonio. They attended a grocery shopping tour and cooking class conducted by a registered dietitian, focusing incorporating fruit and vegetables into meals, and a monthly $40 voucher, redeemable for fruit and vegetables. Mothers with high menu planning and grocery shopping skills and more fruit at home reported higher fruit intakes. Mothers with high grocery shopping skills reported higher vegetable intakes. Compared to baseline, the reported home availability of fruit, and fruit and vegetable intakes were significantly improved at post 1; fruit and vegetable home availability, menu planning and grocery shopping skills, and fruit and vegetable intakes were significantly higher at post 2

Targeting Agricultural Input Subsidy Coupons in Malawi

This paper analyses the factors that influence access to agricultural input subsidies in Malawi. The results show that vulnerable households such as the poor and elderly-headed are less likely than other households to receive fertilizer coupons and receive less of the subsidized fertilizers. Households with larger parcels of land and those who sell part of their produce (commercialized) are more likely to receive coupons and also tend to acquire more fertilizers. Use of open meetings in the allocation of coupons tends to favour the poor and the poor receive more fertilizer compared with discrete of coupons. We also find a positive relation between participation in other social safety nets and access to subsidized fertilizer coupons, suggesting that households that participated in other social safety net programmes are not excluded from the input subsidy programme by virtue of benefiting from other social assistance programmes

InShopnito: an advanced yet privacy-friendly mobile shopping application

Mobile Shopping Applications (MSAs) are rapidly gaining popularity. They enhance the shopping experience, by offering customized recommendations or incorporating customer loyalty programs. Although MSAs are quite effective at attracting new customers and binding existing ones to a retailer's services, existing MSAs have several shortcomings. The data collection practices involved in MSAs and the lack of transparency thereof are important concerns for many customers. This paper presents inShopnito, a privacy-preserving mobile shopping application. All transactions made in inShopnito are unlinkable and anonymous. However, the system still offers the expected features from a modern MSA. Customers can take part in loyalty programs and earn or spend loyalty points and electronic vouchers. Furthermore, the MSA can suggest personalized recommendations even though the retailer cannot construct rich customer profiles. These profiles are managed on the smartphone and can be partially disclosed in order to get better, customized recommendations. Finally, we present an implementation called inShopnito, of which the security and performance is analyzed. In doing so, we show that it is possible to have a privacy-preserving MSA without having to sacrifice practicality

Transformational Solar Array Option I Final Report

This report summarizes the work performed under NASA contract NNC16CA19C from May 2, 2017 through April 2, 2018. This work is directed toward meeting the goals of the associated NASA NRA and, of course, the requirements of the contract. In brief, the goals are: (1) Over 47% beginning of life cell efficiency at 5 AU and -125 C (2) Over 32% end of life efficiency at the blanket level at 50 W m-2, -125 C and 4E15 1 MeV e cm-2 (3) Over 8 W kg-1 at EOL for the entire array including structure, deployment, and pointing mechanisms using beginning of life performance. (4) A stowed packaging density of greater than 66 kW m-3 (5) An ability to survive launch and numerous deploy retract cycles without degradation (6) An output higher than 300 V (7) An ability to operate in a plasma generated by xenon thrusters, typically 1E8 cm-3 ions with an average energy of 2 eV (8) A design compatible with electrostatic and magnetic cleanliness (9) Record breaking inverted metamorphic (IMM) 6 junction solar cells (10) IMM solar cells that have no anomalous flat spot behavior at low irradiance and low temperature (11) A mock-up production line for the low-cost manufacture of spacecraft blanket arrays. The Option I phase of the project continued efforts, started in the base-phase, to eliminate or reduce to very low levels the flat spots that reduce power to an unacceptable value in a significant percentage of cells and to reduce outgassing contamination of the concentrators to acceptable levels. Option I adds tasks to increase the efficiency of IMM cells from those produced in the Base Phase, to eliminate delamination of the coatings that were present in previous versions of the concentrator mirrors, to evaluate pressure sensitive adhesive as a method of fixing solar cell assemblies to blankets, to design a magnetically clean brake for ROSA, to test the robustness of a sample blanket in deploy and retract, to test for the adequate performance of a blanket in vibration and thermal environments, and to define the capital equipment needed to optimize production of the Transformational Array. 5 Work for this Final Report showed that the greatest likely improvement in the solar cells would be by emphasizing the effort for the IMM4 solar cells and stopping work on other IMM cells. For this phase, the solar cell work was primarily on the IMM4 cells with little work on IMM5 and none on IMM6 cells

Food Accessibility Related to Double Your Dollar Program

The Double Your Dollar (DYD) Program is a program that gives Supplemental Nutrition Assistance Program (SNAP) beneficiaries and Senior Farmers’ Market Nutrition Program (SFMNP) participants match dollars to spend at local farmers markets. Users are able to spend these dollars on fruits, vegetables, eggs, meats, dairy, jam/jelly, honey and food producing plants. DYD’s goal is to incentivize healthy eating among individuals of low income, promote local purchases, and increase spending at farmers markets. Food insecurity effects over 60,000 individuals in Washington and Benton county. With food accessibility being an area of concern in Northwest Arkansas, programs like SNAP and SFMNP are significant in helping individuals acquire nutritious food. The goal of this study was to assess how the DYD program has impacted users’ food accessibility and how the program can be improved for the future. Types of food purchased were assessed because this gives insight on an individual’s health. Individuals of lower income are known to generally have poorer health status which is related, in part, to the food they are consuming. By assessing how DYD users altered their purchases because of the program, inferences can be made on how this program is affecting their nutritional status. Food accessibility was evaluated through analyzing how much food users are able to purchase. Additionally, customer shopping patterns were studied because this gives insight to how the program can be improved in the future. A survey was created to address these areas and was distributed to participants taking part in the DYD program at farmers markets in Washington and Benton county. A total of 80 surveys were obtained and results were analyzed using Qualtrics Survey Software. The results indicated that the vast majority of current DYD users had increased purchases and consumption of fresh fruits, vegetables, eggs, meat, and dairy. Main motivations for shopping at the farmers market included the ability to buy fresh, healthy, and quality foods. Main obstacles for shopping at the farmers market included price and type of food available. Previous research has shown that purchases made to locally owned businesses and farmers create more jobs and improves local wealth. Therefore, the purchases made through DYD potentially contributes additionally to improve the local economy. Overall, the DYD program suggests being successful in improving food accessibility. This study indicates that food assistance programs such as DYD could be replicated throughout the country to improve local food accessibility and as a result, improve nutritional status among individuals of low income. Future studies should assess the awareness of the program within the community since this study only assessed participants that were already participating and the impacts of those purchases on buying and eating behaviors

The Farm Input Subsidy Programme (FISP) 2009/10: A review of its implementation and impact

This report reviews the 2009/10 implementation of the Farm Input Subsidy Programme 2009/10 in the context of experience from 2005/6 to 2008/9. The 2009/10 programme differed from previous years in restriction of fertiliser subsidies to maize production, reduced fertiliser distribution budgets which were also adhered to, large increases in maize (particularly hybrid) and legume seed distribution, considerable carry forward of fertiliser stocks from previous year purchases, and earlier sales of fertiliser. These changes all have important positive implications for the programme’s effectiveness and efficiency as a result of reduced displacement, improved targeting, reduced programme costs (which also benefited from lower fertiliser prices), improved returns to use of subsidised fertiliser on hybrid maize, and food security, diversification and soil fertility benefits from the increased legume seed sales. Increased maize and legume seed sales through private retailers should also stimulate input market development. The economic benefit cost ratio for the programme is estimated at 1.12, a respectable result (despite the many difficulties with this analysis and its blindness to many longer term and intangible benefits) with considerable potential for further improvement. The macro-economic costs of the programme have also been substantially reduced as compared with the previous year and the year on year rises in costs halted. These are important achievements. There are two main areas where it is proposed that programme implementation could look for substantial improvements in the future: first in achieving greater transparency in beneficiary identification and coupon issues and second in allowing earlier sales of inputs. Greater transparency in beneficiary identification and coupon issues should build on achievements over the last four years (for example in improved targeting and use of open meetings) by (a) resolving inconsistencies both in changing MoAFS farm family numbers across regions and with NSO estimates, (b) improving effective communication about coupon allocation and distribution systems, (c) increasing the transparency and accountability of these processes with, for example, the involvement of different stakeholders representing farmers, and (d) sharing and implementing good practice in particular districts or areas more widely across the country. Earlier input sales are important for reducing the costs and risks faced by farmers in redeeming coupons, promoting higher yield responses from earlier planting and fertiliser application, reducing pressures and costs in fertiliser deliveries to markets, and giving farmers more voice and choice when redeeming coupons. This requires that the 2009/10 improvements in fertiliser deliveries and in seed contracting are sustained and accompanied by earlier finalising of coupon allocations and printing than in 2009/10 – as has already been recognised by strenuous attempts to achieve earlier commencement of sales in 2010