# SSSS Mobile — Secret Key Sharing

> Cryptographic tool for splitting and reconstructing text secrets using Shamir's Secret Sharing Scheme. (iPhone/iPad app by QR Wild LLC.)

- Source: https://appshunter.io/ios/app/ssss-mobile/id1505136665 (this page in markdown: same URL + `.md`)
- Developer: [QR Wild LLC](https://appshunter.io/developer/975358305)
- Category: Productivity, Utilities
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 9 MB
- Languages: English
- Released: 2020-04-03
- Data updated: 2026-06-02
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ssss-mobile/id1505136665/reviews.md

## What is SSSS Mobile?

SSSS Mobile is an implementation of Shamir's Secret Sharing Scheme (SSSS). In cryptography, Secret Sharing allows you to split a short "secret" text into multiple shares for later reconstruction when a specified threshold of shares are available. 

With SSSS Mobile, shares can be copied into another application or encoded in a QR Code and shared via email. Shares can later be retrieved from text, QR Code or NFC Tag (when available). You can also write shares to an NFC tag using a 3rd party NFC app. The optional Token parameter is prefixed to the share text to help describe the share or threshold.

Some possible use cases for SSSS Mobile:

* Split a short message intended for a group of individuals to decode only when the group is together. It may be interesting to store the shares on NFC tags attached to physical objects in this scenario.

* Split an important but rarely used strong password across multiple QR Codes. Print and hide these QR codes in multiple locations for later retrieval. 

* Encrypt a large file with a difficult to remember password. Store the file in a potentially insecure location, but store the SSSS shares that protect your password in various other locations. Perhaps hide a large number of shares but only require a lower threshold for combination later if there is potential for some shares to be lost.

* Encrypt the private key to your Bitcoin or other cryptocurrency holdings with an impossible to remember password. SSSS split the password, print the shares to QR Code and bury them in multiple locations. Require a lower threshold than the total number of hidden shares in case some are lost or damaged over time. 

IMPORTANT #1: If you intend to protect potentially important information, please take all necessary backup precautions and use at your own risk!

IMPORTANT #2: The threshold must be met EXACTLY at the time of retrieval/combination. You cannot combine more or less than the exact threshold specified at the time that the share set is generated. It may be useful to use the optional Token parameter to indicate the threshold. Combining the wrong number of shares or invalid shares may result in an error OR an incorrect secret message reconstruction.

IMPORTANT #3: The secret message must be 128 characters or less. The longer the message, the more processing time will be required for splitting and combining. For large secrets it is recommended to encrypt with a tool such as PGP/GPG and SSSS split only the password.

Additional Notes:
* This app uses the ssss-js library by Gabriel Burca to be compatible with the "ssss" UNIX/Linux application by B. Poettering.

## Key features

- Split secrets into multiple shares
- Reconstruct secrets with a threshold
- Share shares via QR code
- Share shares via text
- Retrieve shares from QR code
- Retrieve shares from NFC Tag


## Frequently asked questions about SSSS Mobile

### What is SSSS Mobile?

SSSS Mobile is a productivity app that implements Shamir's Secret Sharing Scheme. It allows users to split a short secret text into multiple shares that can be reconstructed later when a specified threshold of shares is available.

### How does SSSS Mobile work?

You can input a secret text (up to 128 characters), and the app will split it into a set number of shares. These shares can then be distributed via QR codes or plain text. To reconstruct the secret, you need to provide the exact threshold number of shares.

### What are the use cases for SSSS Mobile?

Potential uses include securely sharing passwords for cryptocurrency private keys, splitting important messages for group decoding, or hiding QR codes of strong passwords in multiple physical locations.

### Can I use SSSS Mobile offline?

The description does not explicitly state offline functionality, but the core mechanics of splitting and reconstructing secrets do not inherently require an internet connection. Shares can be generated and stored locally.

### What is the character limit for secrets in SSSS Mobile?

The secret message must be 128 characters or less. For larger secrets, it is recommended to encrypt the content first and then use SSSS Mobile to split the password used for encryption.

### Does SSSS Mobile have ads?

No, SSSS Mobile does not contain advertisements. The app is free to download and use without any ad interruptions.

### What devices is SSSS Mobile compatible with?

SSSS Mobile is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS ecosystem.

### How often is SSSS Mobile updated?

The latest version of SSSS Mobile is 1.0.3.1, which was last updated on August 13, 2023. This indicates a relatively infrequent update schedule.

## Version history (last 4 releases)

### 1.0.3.1 — 2023-08-13

* Minor bug fixes and usability improvements

### 1.0.2.0 — 2020-04-14

* Added random string/password generator for secret message. This will make it easier to copy/paste a password into encryption software at the same time that SSSS shares are generated.

### 1.0.1.0 — 2020-04-06

* Removed NFC write button from non-NFC devices
* Fixed bug with non-numeric Threshold/Share sizes

### 1.0 — 2020-04-03

No release notes.

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## More apps by QR Wild LLC

- [Guess My Face - Card Viewer](https://appshunter.io/ios/app/guess-my-face-card-viewer/id1239430138)
- [collective.network](https://appshunter.io/ios/app/collectivenetwork/id1579628341)
- [ReciScan - Cookbook Maker](https://appshunter.io/ios/app/reciscan-cookbook-maker/id6478405196)

All apps by QR Wild LLC: https://appshunter.io/developer/975358305

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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 2026-06-02.*