The term “shift left” is a reference to the Software Development Lifecycle (SDLC) that describes the phases of the process developers follow to create an application. Often, this lifecycle is depicted as a horizontal timeline with the conceptual and coding phases “starting” the cycle on the left side, so to move any process earlier in the cycle is to shift it left. “Shift-left security” is the concept that security measures, focus areas, and implications should occur further to the left—or earlier—in the lifecycle than the typical phases that used to be entry points for security testing and protections.
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