iPhone app Sub Cipher download it using MyAndroid.

Sub Cipher is an easy-to-use Encoder/Decoder app, which can encode or decode simple substitution ciphers.

It works on the Caesar and Atbash style cipher methods, which are simple offset-alphabet ciphers.
The well-known Rot13 cipher is one of these.

Simply type or copy-paste your encoded or decoded text to and from e-mail, messages, social media, and it is immediately converted for you.
Up to 2,000 characters can be converted at a time.

You can also capture the settings you have dialed in (as lines of text) to save in another document.
This can be useful if you are publishing a newsletter or book of ciphers, and want to keep the settings you used with each cipher along with the cipher itself.

Here are the main features:

*Easy to use.
Type into the plain-text or the cypher-text box, and the converted text is immediately displayed.

*Easy to transfer.
You can select all the converted text and paste it into any other text document.

*Easy to adjust.
Any substitution offset, forward or reverse can be dialed in.

*Easy to save.
The settings you dial in can also be saved as text for your notes.

Caveat Emptor: These ancient styles of ciphers are very simple and easy to decode! This is simply a fun utility, and is not intended for serious secret message work.,

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