I'm trying to make my master password easier to remember than one consisting of four random words from the 1P password generator, as I believe are the current recommendations.
I'm thinking of using a nonsense phrase but an entire phrase nonetheless. However, I'm having a hard time figuring out the exact entropy (measured in bits) of a phrase adhering to English grammar rules, so I can know for certain when the phrase is secure enough.
I know using a proper phrase will cause a drop in entropy because of the decrease in randomness of the order of the words, but by how much?
Would love to hear your thoughts on this.