I want to create a Seed-Phrase (mnemonics) from entropy. One aspect of
BIP39 is to create the checksum and describes it as follows (Link BIP39):
The mnemonic must encode entropy in a multiple of
32bits. With more entropy, security is improved but the sentence length increases. We refer to the initial entropy length as ENT. The allowed size of
128-256 bitsFirst, an initial entropy of
ENTbits is generated. A checksum is generated by taking the first
ENT / 32
This thread describes a lot of details but not why divider
32 (or I don't understand it).
I am not a cryptographer and I did not find any detailed description why the divider
32 has been chosen. My guess is entropy. But why exactly?