---
_id: '66864'
abstract:
- lang: eng
  text: When signing digital documents, users often insert scanned or digitized handwritten
    signatures, which provide no assurance of a document’s authenticity and integrity.
    Cryptographic signatures offer such guarantees, but are rarely adopted due to
    persistent usability challenges. This paper explores the potential of digital
    identity wallets for securely and intuitively signing documents with verified
    personal data. To this end, we developed IdentitySign, an open-source prototype
    application, and evaluated it through a user study (N=74). Our results indicate
    good usability but also reveal potential pitfalls for this and similar wallet-based
    signature applications, such as unjustified trust in documents with signatures
    that are cryptographically valid but signed by the wrong signer. We provide guidelines
    and insights for creating user-centric, secure, and trustworthy digital signage
    applications using identity wallets.
author:
- first_name: Yorick
  full_name: Last, Yorick
  id: '100966'
  last_name: Last
  orcid: 0009-0008-9529-2427
citation:
  ama: 'Last Y. IdentitySign: Design and User Study of a Prototype Application for
    Digitally Signing Documents Using an Identity Wallet. In: <i>Proceedings of the
    Twenty-Second Symposium on Usable Privacy and Security</i>. ; 2026.'
  apa: 'Last, Y. (2026). IdentitySign: Design and User Study of a Prototype Application
    for Digitally Signing Documents Using an Identity Wallet. <i>Proceedings of the
    Twenty-Second Symposium on Usable Privacy and Security</i>. Twenty-Second Symposium
    on Usable Privacy and Security, Hannover, Germany.'
  bibtex: '@inproceedings{Last_2026, title={IdentitySign: Design and User Study of
    a Prototype Application for Digitally Signing Documents Using an Identity Wallet},
    booktitle={Proceedings of the Twenty-Second Symposium on Usable Privacy and Security},
    author={Last, Yorick}, year={2026} }'
  chicago: 'Last, Yorick. “IdentitySign: Design and User Study of a Prototype Application
    for Digitally Signing Documents Using an Identity Wallet.” In <i>Proceedings of
    the Twenty-Second Symposium on Usable Privacy and Security</i>, 2026.'
  ieee: 'Y. Last, “IdentitySign: Design and User Study of a Prototype Application
    for Digitally Signing Documents Using an Identity Wallet,” presented at the Twenty-Second
    Symposium on Usable Privacy and Security, Hannover, Germany, 2026.'
  mla: 'Last, Yorick. “IdentitySign: Design and User Study of a Prototype Application
    for Digitally Signing Documents Using an Identity Wallet.” <i>Proceedings of the
    Twenty-Second Symposium on Usable Privacy and Security</i>, 2026.'
  short: 'Y. Last, in: Proceedings of the Twenty-Second Symposium on Usable Privacy
    and Security, 2026.'
conference:
  end_date: 2026-08-26
  location: Hannover, Germany
  name: Twenty-Second Symposium on Usable Privacy and Security
  start_date: 2026-08-24
date_created: 2026-08-27T11:35:09Z
date_updated: 2026-08-27T11:35:37Z
department:
- _id: '679'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.usenix.org/system/files/soups2026-last.pdf
oa: '1'
publication: Proceedings of the Twenty-Second Symposium on Usable Privacy and Security
status: public
title: 'IdentitySign: Design and User Study of a Prototype Application for Digitally
  Signing Documents Using an Identity Wallet'
type: conference
user_id: '100966'
year: '2026'
...