This paper discusses Kenya’s macroeconomic policies during the 1980s. It specifically analyzes issues of food security as it relates to market performance and policies. This is followed by projections of the effects of various policy changes and market conditions on grain production, consumption, and imports over a five year period. It appears that structural adjustment policies have consequenc...

Existing web services and mashups exemplify the need for flexible construction of distributed applications. How to do so securely remains a topic of current research. We present TAPIDO, a programming model to address Trust and Authorization concerns via Provenance and Integrity in systems of Distributed Objects. Creation of TAPIDO objects requires (static) authorization checks and their communi...

LDAP directories offer a fine-grain authorization framework, but these capabilities are often ignored by poorly written applications which require accounts with very high privileges to manage LDAP data. Proxied Authorization is a LDAP security mechanism which helps to develop less critical client applications. Unfortunately, developers of client applications seem to ignore this opportunity. The...

We propose two symmetric-key management schemes for the encryption of scalable compressed video content. The schemes are applicable to MPEG-4 Fine Grain Scalability video coding. Our constructions make use of only hash functions and achieve the optimal bound regarding the minimum number of keys and the time complexity in computing all the decryption keys. We also formalize new security notions ...

Evapotranspiration (ET) is an important component of the hydrologic budget because it expresses the exchange of mass and energy between the soil-water-vegetation system and the atmosphere. Prevailing weather conditions influence potential or reference ET through variables such as radiation, temperature, wind, and relativity humidity. In addition to these weather variables, actual ET (ETa) is al...

Our contributions are applying distinguishing attack on Linearly Filtered NLFSR as a primitive or associated with filter generators. We extend the attack on linear combinations of Linearly Filtered NLFSRs as well. Generally, these structures can be examined by the proposed techniques and the criteria will be achieved to design secure primitive. The attacks allow attacker to mount linear attack ...

Software systems are becoming heterogeneous: instead of a small number of large programs from well-established sources, a user’s desktop may now consist of many smaller components that interact in intricate ways. Some components will be downloaded from the network from sources that are only partially trusted. A user would like to know that a number of security properties hold, e.g. that persona...

Software systems are becoming heterogeneous: instead of a small number of large programs from well-established sources, a user’s desktop may now consist of many smaller components that interact in intricate ways. Some components will be downloaded from the network from sources that are only partially trusted. A user would like to know that a number of security properties hold, e.g. that persona...

Based on the background of construct the national grain strategy project of Henan province core and construct Zhongyuan Economic Zone, considering the Henan province's cultivated land resources use efficiency and food security, using multiple linear regression model and the principal component analysis to analyze the cultivated land resources’ use efficiency between 1999-2008 of Henan province,...

The recent Russia–Ukraine conflict has raised significant concerns about global food security, leaving many countries with restricted access to imported staple crops, particularly wheat and sunflower oil, sending prices soaring other adverse consequences in the supply chain. This detrimental effect is prominent for low-income relying on grain imports, record-high inflation affecting their livel...