Mo. Rev. Stat. § 28.666
Unless otherwise provided by law or contract, a certificate issued by a licensed certification authority is an acknowledgment of a digital signature verified by reference to the public key listed in the certificate, regardless of whether words of an express acknowledgment appear with the digital signature or whether the signer physically appeared before the certification authority when the digital signature was created, if that digital signature is:
(L. 1998 S.B. 680 § 23)