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Suggests a series of guidelines for avoiding a common security pitfall when combining encryption with digital signatures. Problem with sign-and-encrypt combination; Difference between sign-and-encrypt combination and symmetric encryption; Information on the repair options for sign-and-encrypt problem. INSET: How Did This Happen?.

Several letters to the editor are presented in response to articles in previous issues including "New Business Model Needed to Replace the Status Quo" in the October 2009 issue, "Attracting New Blood Tougher Than Building Jets and ICBMs" in the September 2009 issue, and "Today's Fights Expose Technological Weak Spots" in the November 2009 issue.

The article offers information on the Rexnord ZAF6000 series SHURLOK Adapter Mounted Roller Bearings from Rexnord Industries. These bearings were used on the coal conveyors located at the Leland Olds Station of Basin Electric cooperative in Stanton, North Dakota to eliminate unscheduled downtime and time-consuming bearing replacement. It talks about the features of the bearings such as a positive locking system, a tapered adapter sleeve, and a spyglass optical strain sensor (OSS).

Discusses the two basic approaches to designing hardware using a software language. Elaboration methodology; Compilation methodology; Suggestion in order for a compiler to generate hardware implementations based on software code.