# Crypto: Cæsar and Vigenère ciphers

> Encrypt and decrypt messages using Caesar and Vigenère ciphers. (iPhone/iPad app by Maxim Aleksa.)

- Source: https://appshunter.io/ios/app/crypto-csar-and-vigenere-ciphers/id1025345594 (this page in markdown: same URL + `.md`)
- Developer: [Maxim Aleksa](https://appshunter.io/developer/1025345593)
- Category: Utilities, Entertainment
- Price: Free
- Rating: 4.70/5 from 11 App Store ratings
- Age rating: 4+
- Requires: iOS 8.4 · 9 MB
- Languages: American English
- Released: 2015-08-08
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/crypto-csar-and-vigenere-ciphers/id1025345594/reviews.md

## What is Crypto?

Dive into cryptography with Crypto. Use Caesar and Vigenère ciphers and encrypt and decrypt messages.

CRYPTO
Crypto allows you to encrypt and decrypt messages using Caesar and Vigenère ciphers. Create a message, select a key or a keyword, and then send the encrypted message to your friends. Similarly can you decrypt encrypted messages.

CIPHERS
In both Caesar and Vigenère ciphers, each letter is substituted with another, which makes them substitution ciphers. Only those who know the secret key are able to decrypt messages, though it is possible to decrypt an encrypted message without knowing the key by using brute force.

CAESAR CIPHER
In the case of Caesar’s cipher, we use a secret integral key (k). This secret key is used to rotate (i.e. shift) each letter by k places, wrapping A to Z and a to z as needed. For example, if we use the key of 1 to encrypt “Hello world!”, we will get “Ifmmp xpsme!” To decrypt this message, shift the letters backward.

VIGENÈRE CIPHER
Vigenère cipher improves upon Caesar cipher by shifting letters using different keys. This sequence of keys is known as a keyword. Each letter in the keyword represents by how far the corresponding letter in the original message will be shifted (A and a represent 0, B and b represent 1, Z and z represent 25). If we encrypt “Hello world!” with the keyword “Squirrel”, we will get “Zuftf nscdt!”

## Key features

- Caesar cipher encryption/decryption
- Vigenère cipher encryption/decryption
- Create encrypted messages
- Decrypt encrypted messages
- Uses secret keys or keywords


## Frequently asked questions about Crypto

### What is Crypto?

Crypto is a utility app that allows you to encrypt and decrypt messages using the Caesar and Vigenère cipher methods. You can create secret messages to send to friends or decode messages you receive.

### How does the Caesar cipher work in Crypto?

The Caesar cipher in Crypto shifts each letter of your message by a secret integral key (k). For example, a key of 1 shifts 'A' to 'B', 'B' to 'C', and so on, wrapping around from 'Z' to 'A'.

### How does the Vigenère cipher work in Crypto?

The Vigenère cipher improves on the Caesar cipher by using a keyword. Each letter in the keyword determines how many places the corresponding letter in the message is shifted. 'A' or 'a' represents a shift of 0, 'B' or 'b' a shift of 1, up to 'Z' or 'z' for a shift of 25.

### Can I decrypt messages without the key in Crypto?

While the app is designed for known keys, the description mentions that it is possible to decrypt an encrypted message without knowing the key by using brute force, though this is not a feature directly implemented in the app's interface.

### Is Crypto available on Android?

Based on the provided data, Crypto is supported on iPhone, iPad, and iPod. There is no information indicating support for Android devices.

### How often is Crypto updated?

Crypto was last updated on August 8, 2015, with version 1.0. This indicates that the app has not received updates for a significant period.

### What is the age rating for Crypto?

Crypto has an age rating of 4+, making it suitable for a wide range of users. The app focuses on basic cryptographic principles.

### Does Crypto have ads?

No, Crypto does not contain advertisements. The app is completely free to use without any interruptions from ads.

## Version history (last 1 release)

### 1.0 — 2015-08-08

This app has been updated by Apple to display the Apple Watch app icon.

## Apps similar to Crypto

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Cipher Pixel](https://appshunter.io/ios/app/cipher-pixel/id6479542527) | — | Free | Utilities |
| [Text Encryption Tool](https://appshunter.io/ios/app/text-encryption-tool/id1624197966) | 3.5 (2) | Free | Utilities |
| [Kryptos Tools](https://appshunter.io/ios/app/kryptos-tools/id6451396051) | 4.8 (6) | Free | Utilities |
| [Crypto Tools (De)Encryption](https://appshunter.io/ios/app/crypto-tools-deencryption/id1670173533) | 5.0 (1) | Free | Utilities |
| [hashmaster](https://appshunter.io/ios/app/hashmaster/id6447977369) | 5.0 (1) | Free | Utilities |
| [Paranoia Text Encryption Lite](https://appshunter.io/ios/app/paranoia-text-encryption-lite/id1092955070) | 4.5 (82) | Free | Utilities |

## More apps by Maxim Aleksa

- [MPrinter](https://appshunter.io/ios/app/mprinter/id1204506575)

All apps by Maxim Aleksa: https://appshunter.io/developer/1025345593

## Related topics

[caesars cipher](https://appshunter.io/ios/topics/caesars-cipher) · [cipher caesar](https://appshunter.io/ios/topics/cipher-caesar) · [cipher rounds](https://appshunter.io/ios/topics/cipher-rounds) · [cipherrounds](https://appshunter.io/ios/topics/cipherrounds) · [caesar cipher](https://appshunter.io/ios/topics/caesar-cipher) · [cypher rounds](https://appshunter.io/ios/topics/cypher-rounds) · [ciphera](https://appshunter.io/ios/topics/ciphera) · [cipher sender](https://appshunter.io/ios/topics/cipher-sender) · [cipher tool](https://appshunter.io/ios/topics/cipher-tool)

---

*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 2026-06-11.*