Attribute-Based Access Control (ABAC) provides a strategy for setting up access rules by exploiting attributes of principals and objects from an enterprise information system or digital credentials. ABAC can replace or complement other approaches like Access Control Lists (ACLs) and Role-Based Access Control (RBAC). In recent years, there has been a growth of other attribute-based systems including Attribute-Based Encryption (ABE) and Attribute-Based Messaging (ABM). In ABM email messages use addresses that describe recipient attributes rather than an explicit list of the recipients. Such addressing makes messages more efficient, exclusive, and intensional but raises challenges for security and privacy. This talk will discuss attribute-based security systems in general and use of ABAC and ABE to solve security problems faced by ABM. We describe requirements for ABM and a practical architecture that addresses them. We have built a prototype and collected performance results that show its feasibility for at least mid-size organizations. We end with some speculation on other ways to exploit attribute-based security techniques for goals like adding protection to databases and multi-tier web systems.
Options traders bet on which direction they think the price of a stock will go. Options contracts can be based on a wide variety of underlying securities, however, and many different types of orders can be placed, which makes them more versatile than stocks.
Buying and selling options, and more.
Sell at the agreed upon price Sell the contract to another investor Let the contract expire.
Considerations for options traders.
Low commissions are just the tip of the iceberg when it comes to choosing the best option trading platform.
Traders need to consider hidden fees, such as platform fees and data fees. Different traders have different skill levels, trading strategies and needs.
Options trading can be complicated, and beginners need to make sure to find a platform with plenty of educational resources and guidance. Advanced traders need to look for professional-grade features and research. Before choosing the right broker, each trader needs to consider his or her trading style and which features are most important in maximizing profitability.
Best Low-Cost Broker-Ally Invest.