Edited ch04_keys.adoc with Atlas code editor

ch04_keys.adoc

@@ -42,7 +42,7 @@ Based on these mathematical functions, cryptography enables the creation
 of unforgeable digital signatures. Bitcoin uses
 elliptic curve addition and multiplication as the basis for its cryptography.
 
-In Bitcoin, we can use public key cryptography to create a key pair that
+In Bitcoin, we can use public key cryptography to create a ((("key pairs", id="key-pair")))((("public keys", "purpose of")))((("private keys", "purpose of")))key pair that
 controls access to bitcoins. The key pair consists of a private key
 and a public key derived from the private key. The public key is used to
 receive funds, and the private key is used to sign transactions to spend
@@ -66,7 +66,7 @@ pairs, each consisting of a private key and a public key. The private
 key (k) is a number, usually derived from a number picked at random.
 From the private key, we
 use elliptic curve multiplication, a one-way cryptographic function, to
-generate a public((("public key cryptography", startref="pub-key"))) key (K).
+generate a public((("public key cryptography", startref="pub-key")))((("key pairs", startref="key-pair"))) key (K).
 
 .Why Use Asymmetric Cryptography (Public/Private Keys)?
 ****