Abstract: Embodiments relate to systems, devices, and computer-implemented methods for creating a loadable image and using the loadable image for restarting an application. The method can include starting, by a computing device, initialization of the application, and identifying upon initialization of the application, a plurality of resources associated with the application. The method can further include determining checkpoints associated with the plurality of resources. In addition, the method can include creating an optimized image corresponding to the application based on the checkpoints and an optimization of an application image, and storing the optimized image in a memory. Further, the method can include restarting the application by replacing a current process image with a new process image, and updating the new process image with one or more elements of the optimized image.

Abstract: Various implementations for verifying that a user device is being operated by a person are described. In some implementations, a method includes receiving a challenge request. The method selects two or more first images from a first image category and one or more second images from one or more second image categories, which are distinct from the first image category. The method sends a challenge to the user device for presentation to the person. The challenge includes a challenge parameter and data describing the two or more first images and the one or more second images. The method receives a challenge response from the user device describing a user selection of at least one image from among the two or more first images and the one or more second images and determines a result of the challenge based on the challenge response and the challenge parameter.