Strengthening State and Local Cyber Crime Fighting Act of 2017 This bill amends the Homeland Security Act of 2002 to establish within the Department of Homeland Security (DHS) a National Computer Forensics Institute, to be operated by the U.S. Secret Service. The institute: shall disseminate homeland security information related to the investigation and prevention of cyber and electronic crime and related threats; shall educate, train, and equip state, local, tribal, and territorial law enforcement officers, prosecutors, and judges; shall ensure that timely, actionable, and relevant expertise and homeland security information related to cyber and electronic crime and related threats is shared with such officers and prosecutors; may provide such officers with computer equipment, hardware, software, manuals, and tools necessary to conduct cyber and electronic crime and related threat investigations and computer and mobile device forensic examinations; and shall facilitate the expansion of the network of Electronic Crime Task Forces of the Secret Service through the addition of such officers educated and trained at the institute.