Secret Share at App Store analyse

App power index: 100 (based on ranks around App Stores today)
Utilities Productivity
Developer: Yasashi Matsuo
Price: 0 free
Current version: 2.0, last update: 1 year ago
First release : 20 Oct 2017
App size: 11.97 Mb
4.4 ( 144 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


Secret Share is software that performs Shamirs secret sharing method.

The share and combine methods support the following four methods:

 (2, 2) 2 share 2 combine
 (2, 3) 3 share 2 combine
 (3, 3) 3 share 3 combine
 (3, 5) 5 share 3 combine

After sharing, each share piece is about 80 bytes larger than the source data.


It does not have an authentication function.

No error correction code is used.

The calculation is done using the Galois field.
The generated share piece is like a series of coefficients of Galois field of simultaneous equations.

It has something like random oracle.
Therefore, each attempt always produces a different piece of variance.


There is no limit on the size of files (data) that can be handled.

However, I think that
 about 1 MB
will be the realistic maximum size.

The reason is the time it takes to "combine".

The combine of secret sharing using "Shamias secret sharing scheme" takes a lot of time.

 1MB     about 1 minute or less
 about 15MB about 5 to 15 minutes
 about 150MB about 1 hour to 3 hours

It is like this. (I think its faster with a fast machine.)

However, it does not take so much time for share.
Usually, it takes about 1/10 of the time for combine.
However, combine takes much time.

Also, regardless of the number of variances of 3 and 5 share, 3 combine take
more than three times as long as 2 combine.
3 combine is simply 3 times longer than 2 combine.

On an old Windows XP machine, running (3, 5) 5 share 3 combine on a random
number of 158 MB takes such times:

 share 12 minutes 24 seconds
 combine 3 hours 10 minutes

Combining for 3 combine takes a considerable amount of time.
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Available in countries
Country Price
Canada 2.99 CAD
France 1.99 EUR
Germany 1.99 EUR
Italy 1.99 EUR
Netherlands 1.99 EUR
Portugal 1.99 EUR
Spain 1.99 EUR
UK 1.99 GBP
India 199 INR
Japan 250 JPY
Poland 9.99 PLN
Turkey 59.99 TRY
USA 1.99 USD
Korea, Republic Of 1.09 USD
Ukraine 1.99 USD
Available for devices
iPhone5, iPadFourthGen, iPadFourthGen4G, iPhone5c, iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPhone8, iPhone8Plus, iPhoneX, iPad75, iPad76, iPhoneXS, iPhoneXSMax, iPhoneXR, iPad812, iPad834, iPad856, iPad878, iPadMini5, iPadMini5Cellular, iPadAir3, iPadAir3Cellular, iPodTouchSeventhGen, iPhone11, iPhone11Pro, iPadSeventhGen, iPadSeventhGenCellular, iPhone11ProMax, iPhoneSESecondGen, iPadProSecondGen, iPadProSecondGenCellular, iPadProFourthGen, iPadProFourthGenCellular,