# Digital Signature [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) Two digital signature features are provided to offer reliable information, validate the authenticity and integrity of drawings. - **DIGITALSIGN** The DIGITALSIGN command attaches a digital signature to a drawing, which can provide reliable information of the origin, identity and status on a drawing file. And if an unauthorized change is made or the signed file is corrupted, the digital signature becomes invalid.  - **SIGVALIDATE** The SIGVALIDATE command validates the digital signature attached to a drawing file. The Validate Digital Signatures dialog box is displayed that shows information about the digital signature.  - **SIGWARN** Controls whether to issue a warning when opening files with attached digital signatures. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/GstarCAD2023NEW/DigitalSignature.html) · © Gstarsoft Co., Ltd.