Methods are provided for generating an electronic signature, for authenticating said electronic signature, for authenticating integrity of a content signed with said electronic signature, and for authenticating an identity of a signatory who signed said electronic signature, along with systems, computer systems and computer programs suitable for performing said methods. Said methods for generating an electronic signature comprise: receiving a first physical characteristic representative of a person, the first physical characteristic containing a first biometric feature of the person; identifying the first biometric feature in the received first physical characteristic; generating a first biometric mathematical representation representing the first biometric feature of the person; receiving a content to be signed; generating a first content mathematical representation representing the content to be signed; storing the first biometric mathematical representation and the first content mathematical representation in a signature dataset; and computing a first signature mathematical representation of the signature dataset.