By TheStreet.com Staff What Are Treasury Inflation-Protected Securities (TIPS?)?In thebond world, some of the safest investments are Treasury securities. They are issued by the United States government and carry an AAA rating, the highest level of creditworthiness. Since they reflect the “full faith and credit” of the federal government, they are virtually guaranteed never to default. One category of Treasuries strives to protect investments from risinginflation, known as Treasury Inflation-Protected Securities, or TIPS. Their principal increases when inflation rises; conversely, when there’s …