11 CFR §100.36

1. (a)A signature is an individual's name or mark on a writing or record that identifies the individual and authenticates the writing or record. A signature includes an electronic signature, unless otherwise specified.
2. (b)An electronic signature is an electronic word, image, symbol, or process that an individual attaches to or associates with a writing or record to identify the individual and authenticate the writing or record. Examples of electronic signatures include a digital image of a handwritten signature, or a secure, digital code attached to an electronically transmitted message that uniquely identifies and authenticates the sender.
3. (c)A writing or record may be sworn, made under oath, or otherwise certified or verified under penalty of perjury, by electronic signature. A writing or record may be notarized electronically pursuant to applicable State law.