Abstract: A method for providing electronical signing of data using a limited signing device is disclosed. This is achieved by extracting a part of the data in a signature using system, compiling it to a proper protocol used by the signing device and transferring it to said signing device together with a hash of the data. The user of the signing device will then be presented to the compiled part of the data which is adjusted according to the limitations of the signing sevice and which is understandable for the user. The user may then electronically sign the data by means of the signing device using an appropriate signature algorithm. A correct hash proves that the user really signs the intended data, even if he is presented only to an understandable and signing device adjusted part of the data. The resulting signature is returned to the signature using system, and the original data, the part of the data, the hash and the signature are sent to a signature receiving system for processing, verification, storing, etc.

Abstract: A method for electronically and/or digitally signing of data on a small signing device e.g. a mobile phone is disclosed. The method includes a comparison of the data to be signed with one or more set of attributes pre-stored on the signing device and displaying the attribute(s) on said signing device if said data is matching all, a part of or parts of the pre-stored set of attributes. The user of the signing device is then requested to sign the data on basis of the displayed attributes.