Due to agency needs during the COVID-19 pandemic and remote work situations, along with advances in digital signature technology and modernization efforts, ISOO published a notice in the Federal Register (https://www.federalregister.gov/documents/2022/03/29/2022-06548/classified-national-security-information) that digital signatures were expected to be authorized on May 9, 2022 on the Classified Information Non-Disclosure Agreement (NDA), Standard Form (SF) 312.
ISOO has also issued a notice: https://www.archives.gov/files/isoo/notices/isoo-notice-2022-01-digital-signatures-on-sf-312.pdf.
If you have any questions or concerns please contact isoo@nara.gov.