How to check the strength of an encryption algorithm? I asking for advice on how to check strength of an encryption algorithm.
The first step is to write a new question on crypto.stackexchange.com asking for advice on how to check whether if it is secured enough (or not).

The second step is to stop, throw away everything you've done and become an expert in GPG and then port GPG to your platform.

The rationale for being so discouraging is that if you have to ask how to check whether it's secured enough you obviously don't know nearly enough to even start writing an app that encrypts text securely. Many people who would have a very good idea about how to check the security would balk at the task of writing something like GPG themselves.