S.D. Codified Laws § 53-12-21 (2026)
An electronic record or electronic signature is attributable to a person if it was the act of the person. The act of the person may be shown in any manner, including a showing of the efficacy of any security procedure applied to determine the person to which the electronic record or electronic signature was attributable.
Source: SL 2000, ch 225 , § 21.