[PUBLISHER] upload files #173

* PUSH NOTE : 3. Symmetric Key Encryption.md

* PUSH NOTE : 03. Symmetric Key Cryptography (2).md

* DELETE FILE : _posts/lecture-notes/modern-cryptography/2023-09-18-symmetric-key-cryptography-2.md

_posts/lecture-notes/modern-cryptography/2023-09-19-symmetric-key-encryption.md

@@ -13,6 +13,8 @@ tags:
 title: 3. Symmetric Key Encryption
 date: 2023-09-19
 github_title: 2023-09-19-symmetric-key-encryption
+attachment:
+  folder: assets/img/posts/lecture-notes/internet-security
 ---
 
 ## CPA Security
@@ -132,7 +134,7 @@ Additional explanation available in [Modes of Operations (Internet Security)](..
 
 ### Electronic Codebook Mode (ECB)
 
-![is-03-ecb-encryption.png](../../../assets/img/posts/is-03-ecb-encryption.png)
+![is-03-ecb-encryption.png](../../../assets/img/posts/lecture-notes/internet-security/is-03-ecb-encryption.png)
 
 - ECB mode encrypts each block with the same key.
 - Blocks are independent of each other.
@@ -140,7 +142,7 @@ Additional explanation available in [Modes of Operations (Internet Security)](..
 
 ### Ciphertext Block Chain Mode (CBC)
 
-![is-03-cbc-encryption.png](../../../assets/img/posts/is-03-cbc-encryption.png)
+![is-03-cbc-encryption.png](../../../assets/img/posts/lecture-notes/internet-security/is-03-cbc-encryption.png)
 
 Let $X = \left\lbrace 0, 1 \right\rbrace^n$ and $E : \mathcal{K} \times X \rightarrow X$ be a **PRP**.
 
@@ -191,7 +193,7 @@ Note that if $k_1$ is the same as the key used for encrypting messages, then thi
 
 ### Counter Mode (CTR)
 
-![is-03-ctr-encryption.png](../../../assets/img/posts/is-03-ctr-encryption.png)
+![is-03-ctr-encryption.png](../../../assets/img/posts/lecture-notes/internet-security/is-03-ctr-encryption.png)
 
 Let $F : \mathcal{K} \times X \rightarrow X$ be a secure **PRF**.