# Poly Cipher — A Polyalphabetic Cipher

> A Polyalphabetic Cipher (iPhone/iPad app by Blue Sky Appware, LLC.)

- Source: https://appshunter.io/ios/app/poly-cipher/id1550624325 (this page in markdown: same URL + `.md`)
- Developer: [Blue Sky Appware, LLC](https://appshunter.io/developer/675911016)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 62 MB
- Languages: English
- Released: 2021-01-27
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/poly-cipher/id1550624325/reviews.md

## What is Poly Cipher?

"Cryptography is the science of writing messages that no one except the intended receiver can read. Cryptanalysis is the science of reading them anyway." (Missler, Cosmic Codes pg.5)
Vigenere's polyalphabetic substitution cipher, attributed to him around 1553, was considered unbreakable for centuries. It's based on work devised  by Giovan Battista & Leon Battista Alberti. (Alberti is the understated father of modern Cryptology.) And while this type of cipher is easily cracked by the NSA or FBI, your average message snooper will be confounded. Test it out with your friends!


## Version history (last 3 releases)

### 2.0 — 2021-12-08

updated for iOS 15

### 1.2 — 2021-02-13

Added settings feature to hide encoding key; video to briefly explain how encryption works

### 1.0 — 2021-01-27

No release notes.

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All apps by Blue Sky Appware, LLC: https://appshunter.io/developer/675911016

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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.*