A positioning base for an embossing seal has a stand and a positioning assembly mounted on a top of the stand. The stand has two supports on one end and two limit blocks on the other end. The supports are respectively disposed on two sides of the positioning assembly, and the two limit blocks are respectively disposed on the two sides of the positioning assembly. The positioning base can be detachably assembled with a handheld embossing seal together as a desktop embossing seal for use on a desk. The supports and the limits clamp and limit the base of the handheld embossing seal, and the positioning assembly clamps an end of the base. The positioning base provides a firm foundation with the handheld embossing seal, such that the handheld embossing seal can be put on a desk for use, thereby enhancing the stability.

A computing device configured to compute a data function on a function-input value, the device comprising an electronic storage storing a first table network configured for the data function and a second table network configured to cooperate with the first table network for countering modifications made to the first table network, an electronic processor coupled to the storage and configured to obtain first table inputs for the first table network, the first table inputs including the function-input value, and to compute the data function by applying the first table network to the first table inputs to produce first table outputs, the first table outputs including a function-output value corresponding to the result of applying the data function to the function-input value.