How legally secure is the electronic signature in Coposal?

In the digital age, legal transactions are being conducted more and more online. This naturally raises the question of how legally secure the customer's acceptance of your online offer is. Coposal uses the simple electronic signature for this purpose. Legally, this can be compared to a signature when accepting a parcel.

For the signature we use a so-called hash value, which is calculated from the signature image of the customer, the IP address used and a few other attributes. This measure is intended to make subsequent image or database manipulation more difficult or to prevent it. The hash value is a Coposal own checksum and does not represent a qualified method according to the eIDAS regulation. Therefore, this method is not sufficient to be legally binding like an advanced or qualified signature. This would require unique identification via 2-factor authentication (cell phone/SMS, etc.), an ID card, or biometric identification.

In the case of normal online transactions, this can in theory represent an extraordinarily high hurdle for the customer. However, the qualified signature is not absolutely necessary for online transactions either, since a right of revocation applies here. This can only be ruled out if the customer submits another legally binding declaration by post (hand-signed printout / Postident), such as for insurance or banking transactions.


The simple electronic signature, as used in Coposal, is subject to the judicial evaluation of evidence. It therefore constitutes evidence, but does not provide legal certainty. In the end, however, the simple electronic signature definitely offers you more security than a simple web form, where the confirmation is made entirely without a signature.

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