How to store login information using flutter?

Remember that something like login information is "Sensitive information!" and should be stored securely! Shared preferences might not be a good idea to store sensitive data! So you can use the flutter_secure_storage to store login data!

Just for note:

flutter_secure_storage
A Flutter plugin to store data in secure storage:

Keychain is used for iOS
AES encryption is used for Android. AES secret key is encrypted with RSA and RSA key is stored in KeyStore
Note KeyStore was introduced in Android 4.3 (API level 18). The plugin wouldn't work for earlier versions.