But how you will identify it if you are about to retrieve the wallet? You have to put some hint of doing this. This came to my mind but I'm very easy to forget and my memory doesn't works well now.
The "story" part gave me an idea. Maybe it can be encrypted into a poem that can be then memorized. Would be longer but seems easier to memorize than a random sequence of words. Thanks for the suggestion.
Wooah I remember someone suggested and created this type of encryption to his private key. Making a story with the use of your private keys will give confusion if someone accidentally sees your PK's. Thanks for reminding me about this type of sequence and the story thing. This is familiar to me and it's a good way to protect it that way, you don't have to memorize it you only need some hints on what are the most important words.
Mnemonic is an unencrypted private key. If it's discover by unauthorized parties, then they can have complete access to it. The following are the key points to remember.
1. Back up mnemonic immediately, when you create a wallet in imToken
2. Copy mnemonic on a piece of paper, don't use screenshots.
3. Ensure the mnemonic is correct, you can check out by Myetherwallet.
4. Keep your mnemonic safe when you save it.
Anyone who discovers the phrase can steal the bitcoins, so it must be kept safe like cash. Never type it on a website.