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judymcconville@roadrunner.com 2017-04-28 12:40:24 -07:00
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@ -196,7 +196,7 @@ image::images/mbc2_0506.png["Generating entropy and encoding as mnemonic words"]
((("key-stretching function")))((("PBKDF2 function")))The mnemonic words represent entropy with a length of 128 to 256 bits. The entropy is then used to derive a longer (512-bit) seed through the use of the key-stretching function PBKDF2. The seed produced is then used to build a deterministic wallet and derive its keys.
The key-stretching function takes two parameters: the mnemonic and a _salt_. The purpose of a salt in a key-stretching function is to make it difficult to build a lookup table enabling a brute force attack. In the BIP-39 standard, the salt has another purpose&#x2014;it allows the introduction of a passphrase that serves as an additional security factor protecting the seed, as we will describe in more detail in <<mnemonic_passphrase>>.
((("salts")))The key-stretching function takes two parameters: the mnemonic and a _salt_. The purpose of a salt in a key-stretching function is to make it difficult to build a lookup table enabling a brute force attack. In the BIP-39 standard, the salt has another purpose&#x2014;it allows the introduction of a passphrase that serves as an additional security factor protecting the seed, as we will describe in more detail in <<mnemonic_passphrase>>.
The process described in steps 7 through 9 continues from the process described previously in <<generating_mnemonic_words>>: