About
Encrypt and decrypt messages using classic Caesar and Vigenère ciphers. Easily create secret messages to share with friends or decode incoming encrypted text.
What's New in Crypto
1.0
August 8, 2015
This app has been updated by Apple to display the Apple Watch app icon.
Developer apps
FAQ
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.
