diff --git a/README.md b/README.md
index 33715b3..d1f9b04 100644
--- a/README.md
+++ b/README.md
@@ -129,11 +129,12 @@ The "classic" Satoshi-blockchain is like a git repo with a single master branch
    -->
 
 -   **Encryption knowledge**  
-    * [Asymmetric encryption](./Basic/crypto.md#%E9%9D%9E%E5%AF%B9%E7%A7%B0%E5%8A%A0%E5%AF%86)  
-    * [Digital signature & certificate](./Basic/crypto.md#%E6%95%B0%E5%AD%97%E7%AD%BE%E5%90%8D)  
+    * [Basic concepts](./Basic/crypto.md#%E6%95%B0%E5%AD%97%E5%8A%A0%E5%AF%86%E7%9B%B8%E5%85%B3%E7%9F%A5%E8%AF%86) - Asymmetric encryption, Digital signature, Certificate  
+    * [Digital signature extension](./Basic/crypto.md#%E6%95%B0%E5%AD%97%E7%AD%BE%E5%90%8D%E6%89%A9%E5%B1%95)  - Multi-signature, Blind signature, Group signature, Ring signature
     * [Merkle tree](./Basic/crypto.md#merkle-tree)  
     * [Merkle tree in blockchain](./Basic/merkle_tree_in_blockchain.md)  
     * [Merkle DAG](http://www.sohu.com/a/247540268_100222281)   
+    * [**CryptoNote v2.0**](https://cryptonote.org/whitepaper.pdf) - Untraceable Transactions and Egalitarian Proof-of-work
     <!--   
     ### Consensus
        -->
@@ -284,6 +285,7 @@ These apps run on a custom built **blockchain, an enormously powerful shared glo
 
 +   [**How to get started**](https://github.com/iotaledger/iri#how-to-get-started)   
 +   [**Roadmap**](https://www.iota.org/research/roadmap)
++   [**IOTA Transactions, Confirmation and Consensus**](https://github.com/noneymous/iota-consensus-presentation) / [Chinese version](https://github.com/liuchengxu/blockchain-tutorial/blob/master/content/iota/iota_consensus_v1.0.md)
 +   [**More resouces**](./Extension/iota.md)