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This chapter is from the book

Software Project Goals

The problem with the security goals we discussed earlier is that they directly clash with many software project goals. What are these goals like, and why are they important? And what on earth could be more important than security (ha-ha)?

We won't spend much time discussing software project goals in great detail here, because they are covered in many other places. But mentioning some of the more relevant is worth a few words.

Key software project goals include

  • Functionality. This is the number-one driver in most software projects, which are obsessed with meeting functional requirements. And for good reason too. Software is a tool meant to solve a problem. Solving the problem invariably involves getting something done in a particular way.

  • Usability. People like programs to be easy to use, especially when it comes to conducting electronic commerce. Usability is very important, because without it software becomes too much of a hassle to work with. Usability affects reliability too, because human error often leads to software failure. The problem is, security mechanisms, including most uses of cryptography, elaborate login procedures, tedious audit requirements, and so on, often cause usability to plummet. Security concerns regularly impact convenience too. Security people often deride cookies, but cookies are a great user-friendly programming tool!

  • Efficiency. People tend to want to squeeze every ounce out of their software (even when efficiency isn't needed). Efficiency can be an important goal, although it usually trades off against simplicity. Security often comes with significant overhead. Waiting around while a remote server somewhere authenticates you is no fun, but it can be necessary.

  • Time-to-market. "Internet time" happens. Sometimes the very survival of an enterprise requires getting mind share fast in a quickly evolving area. Unfortunately, the first thing to go in a software project with severe time constraints is any attention to software risk management. Design, analysis, and testing corners are cut with regularity. This often introduces grave security risks. Fortunately, building secure software does not have to be slow. Given the right level of expertise, a secure system can sometimes be designed more quickly than an ad hoc cousin system with little or no security.

  • Simplicity. The good thing about simplicity is that it is a good idea for both software projects and security. Everyone agrees that keeping it simple is good advice.

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