# ShadowSign

> ShadowSign (iPhone/iPad app by Jiangsu Guomi Digital Certification Co., Ltd..)

- Source: https://appshunter.io/ios/app/shadowsign/id1505737504 (this page in markdown: same URL + `.md`)
- Developer: [Jiangsu Guomi Digital Certification Co., Ltd.](https://appshunter.io/developer/1505737503)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 18 MB
- Languages: English, Chinese
- Released: 2020-10-08
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/shadowsign/id1505737504/reviews.md

## What is ShadowSign?

ShadowSign 影签是一款基于国产SM2密码算法的PDF文件应用工具，使用影签不但可以在手机上方便的实现对PDF文件的可靠SM2电子签名，而且可以查验文件中已经包含的SM2标准和RSA标准的签名信息


## Version history (last 5 releases)

### 5.1 — 2022-01-25

增加创建文字功能，优化pdf渲染

### 5.0 — 2022-01-19

更新pdf签名位置精确度、优化pdf文件渲染

### 4.0 — 2021-01-04

更新了P10文件ou项

### 3.0 — 2020-12-10

部分界面布局变更、关键字搜索

### 2.0 — 2020-11-23

修复一些bug、适配bc库、修复xs max上的异常问题

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*