Sorry if my English is not completely correct.
I would like to know between bits of entropy for master password(including, Secret Key) and AES-256 Bit , How is it different In terms of the number of bits or the strength of the data encryption ?
I explain as follows,
secret key and master password used to encrypt-decrypt data, protect data in 1password. This is true that you guys describe.
Secret Key that adds 128 bits of entropy to strengthen my Master Password
Therefore, this case will say the strength of all 1password account users will be 128+(bits of master password).
Suppose I created a 20-digit of master password, (in the symbol group: All ASCII printable characters) It has an entropy number of 6.555 bits per 1 character. (I quote the number of bits from this: https://en.wikipedia.org/wiki/Password_strength ),
Therefore the number of bits to be received is 20x6.570 = 131.4 bits
Then, when combined with the bits of the secret key, it will be 128 + 131 = 259 bits.
This is what I would ask you,
259 bit strength that I got and 256 bit-AES,
1. Which is the most important thing to protect from an attack?
Of course, I don't know that any data decoding process,
2. The attacker will guess the strength part of my 259-bit (Received from the my master password and secret key)
Or in the aes-256 bit section directly?
3. An attacker has to use predictions. It is something that talks about exponents. Right? If yes it is 2^259 vs 2^256.