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replaced SVG with PNG

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pull/137/head
Andreas M. Antonopoulos 10 years ago
parent c3a755a721
commit b58da2bca0
11 changed files with 4 additions and 266 deletions
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ch04.asciidoc
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@ -548,7 +548,7 @@ The process of creating the master keys and master chain code for an HD wallet i
[[HDWalletFromSeed]]
.Creating master keys and chain code from a root seed
image::images/HDWalletFromRootSeed.svg["HDWalletFromRootSeed"]
image::images/HDWalletFromRootSeed.png["HDWalletFromRootSeed"]
The root seed is input into the HMAC-SHA512 algorithm and the resulting hash is used to create a _master private key_ (m) and a _master chain code_. The master private key (m) then generates a corresponding master public key (M), using the normal elliptic curve multiplication process +m * G+ that we saw previously in this chapter. The chain code is used to introduce entropy in the function that creates child keys from parent keys, as we will see in the next section.
@ -570,7 +570,7 @@ The parent public key, chain code and the index number are combined and hashed w
[[CKDpriv]]
.Extending a parent private key to create a child private key
image::images/ChildPrivateDerivation.svg["ChildPrivateDerivation"]
image::images/ChildPrivateDerivation.png["ChildPrivateDerivation"]
Changing the index allows us to extend the parent and create the other children in the sequence, e.g. Child 0, Child 1, Child 2 etc. Each parent key can have 2 billion children keys.
@ -615,7 +615,7 @@ Another common application of this solution is for cold-storage or hardware wall
[[CKDpub]]
.Extending a parent public key to create a child public key
image::images/ChildPublicDerivation.svg["ChildPublicDerivation"]
image::images/ChildPublicDerivation.png["ChildPublicDerivation"]
===== Hardened child key derivation
@ -625,7 +625,7 @@ To counter this risk, HD wallets use an alternative derivation function called _
[[CKDprime]]
.Hardened derivation of a child key, omits the parent public key
image::images/ChildHardPrivateDerivation.svg["ChildHardPrivateDerivation"]
image::images/ChildHardPrivateDerivation.png["ChildHardPrivateDerivation"]
When the hardened private derivation function is used, the resulting child private key and chain code are completely different from what would result from the normal derivation function. The resulting "branch" of keys can be used to produce extended public keys which are not vulnerable, since the chain code they contain cannot be exploited to reveal any private keys. Hardened derivation is therefore used to create a "gap" in the tree above the level where extended public keys are used.

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<text text-anchor="middle" x="354" y="-25.4" font-family="Sans" font-size="14.00"> </text>
<text text-anchor="middle" x="354" y="-8.4" font-family="Sans" font-size="14.00">Normal Hierarchical Deterministic (HD) Key Derivation (BIP32)</text>
<g id="graph2" class="cluster"><title>cluster_parent</title>
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<g id="node2" class="node"><title>parent_private_key</title>
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<text text-anchor="middle" x="360" y="-154.9" font-family="Sans" font-size="14.00">One&#45;Way Hash</text>
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<text text-anchor="middle" x="205" y="-154.9" font-family="Sans" font-size="14.00">Parent Chain Code</text>
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<g id="edge21" class="edge"><title>parent_chain_code&#45;&gt;hmac</title>
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111
images/en-hd-root-keys.svg
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<text text-anchor="middle" x="311" y="-8.4" font-family="Sans" font-size="14.00">Creation Of The Master Keys</text>
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<g id="edge2" class="edge"><title>entropy&#45;&gt;hmac</title>
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<g id="edge4" class="edge"><title>hmac&#45;&gt;private_key</title>
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<g id="edge12" class="edge"><title>chain_code&#45;&gt;extended_private_key</title>
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