I recently installed an android app called Secret Space Encryptor and think I found a serious flaw in it.
Let me explain: This app provides a variety of different ciphers to use and I used Threefish 1024 to encrypt a test message with "Your Key" as the key.
I then saved the ciphertext to a text file using the export function in the app. Then I changed the text encryption program in the app to use Blowfish 448 and imported the TF-1024 encrypted message into the app once more.
I then entered the "Your Key" test key and to my total surprise the message successfully decrypted! I encrypted a message with one cipher and then decrypted that same message with a totally different cipher!
Now this should be totally impossible right? If so then is there a deadly flaw in this app?