Mnemonic word preservation: Believe in mathematics rather than intuition Last night I saw this tweet and someone commented that the last mnemonic word can be manually replaced in order to deceive the world. I became interested for a moment. Firstly, I asked if Gemini's "twin mnemonic word" solution is feasible? Answer: It can be achieved. 1. On average, 128 valid twin mnemonic words can be found for every 11 mnemonic words (Gemini names them brother mnemonic words) 2. The safety is extremely poor. Hackers can brute force crack all effective mnemonic words within a few milliseconds. In summary: Theoretically feasible, but completely impractical in terms of safety. Especially when this practice (replacing the last mnemonic word) is known by hackers, they only need to modify the logic of the hacker tool, and you can break the defense within a few milliseconds. If you want to improve this solution, such as randomly replacing a certain mnemonic word (instead of fixing the last one), then it is still simple for hackers to traverse all valid mnemonic words that have been replaced by a single mnemonic word. If you say you want to replace N mnemonic words+disorder, then ensuring that you remember 100% of the original correct mnemonic words will be a huge challenge. This refers to the situation where, years or decades later, you, who are old and dizzy, can still recall the "disordered mnemonic words" from that time accurately and without error.