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These companies are asking questions like, What do we want our retirement plan to do for our employees , What does our retirement program say about our values , and Who should bare the investment risk associated with retirement plans The answers to these questions will help both companies considering changes to their existing programs as well as starting up new plans..

It makes sense for nodes to receive the global time of their immediate neighbors instead of neighbors several hops away In that case, we need to take into consideration the incurred network delays between these nodes and their far-away neighbors An approximation approach can be used nd an upper bound on the error produced by the malicious node Introduction of redundancy to the network is another viable approach For instance, both FTSP and TPSN compute the offset and skew of their clock based on the timing information obtained from only one neighboring node This redundancy approach can be easily.

[ Team LiB ]

applied to FTSP where a set of nodes can be used for the synchronization computations The nodes can take the median of these received multiple updates The private keys can be set up between the nodes and their neighbors at the beginning such that a malicious node can be precluded from injecting erroneous updates into the network Furthermore, if a node becomes aware of one of its neighbors update value being substantially different than the updates from its other neighbors, the node can refrain itself from including the updates from the suspicious neighbor into its computations of clock skew and offset This approach of containment works, however, under the assumptions that the nodes have a suf cient number of sources for the updates For instance, in TPSN, children of the nodes nearby the malicious or compromised node must nd another parent, which may not always be feasible.

[ Team LiB ]

Essentially, maintaining multiple trees comes with a price whereas in FTSP, no such cost exists Utilizing the LS linear regression by each node in the network to compute the skew of its clock can further enhance security in time synchronization protocols Algorithms such as RANSAC [16] can be used for this purpose 174 ATTACKERS AND ATTACKS The possible attacks against time synchronization protocols depend on the nature and capabilities of the attackers We will rst identify three different types of attackers, outline the types of attacks they are capable of, and then discuss the various types of defenses proposed against these types of attacks We will describe the system with the characters regularly used in the description of cryptographic protocols We assume that Alice and Bob (and, potentially, additional nodes Carol, Dave, and so on) are engaging in a time synchronization process.

The primary issue of the DB versus DC debate is simply where does the employer want to target its retirement dollars. (For a moment, let s ignore the significant shift of investment risk from employer to employee.) Do you want your dollars spread evenly across the employee base or do you want to target older, longer service employees Take a look at Table 6.3, which shows the breakdown of where the costs of the typical DB plan are targeted. As you can see, over 90 percent of the plan costs are attributable to the over age 40 population, which only represents about 60 percent of the group. If you look at only those over age 50, the numbers are more skewed. They get about two-thirds of the dollars, but they make up less than onethird of the group in head count. This reverse age discrimination is the dirty little secret of DB plans. The vast majority of the costs are associated

In this chapter, we want to transform test failures into markers, just like the markers used to indicate compile errors In this chapter, we will

The malicious outsider Malory is a wireless device inserted in the range of the nodes of the sensor network, which has the ability to send and receive packets We assume that the attacker can eavesdrop on any ongoing transmission; we can also assume that the attacker can eavesdrop on any ongoing transmission and that the attacker can transmit messages which are physically indistinguishable from the other nodes messages However, this type of attacker does not have access to keys or other con dential information, other than what it can infer from eavesdropping on transmissions Attacker with Jamming and Replay Ability Jimmy is an attacker which has the ability to jam the message, record it, and possibly replay it at later time This type of attack is called a pulse delay attack.