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* PUSH NOTE : 3. Symmetric Key Encryption.md

* PUSH ATTACHMENT : is-03-ecb-encryption.png

* PUSH ATTACHMENT : is-03-cbc-encryption.png

* PUSH ATTACHMENT : is-03-ctr-encryption.png
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Sungchan Yi
2023-10-18 02:03:04 +09:00
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_posts/Lecture Notes/Modern Cryptography/2023-09-19-symmetric-key-encryption.md
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@@ -127,11 +127,11 @@ We learned how to encrypt a single block. How do we encrypt longer messages with
There are many ways of processing multiple blocks, this is called the **mode of operation**.
Additional explanation available in [Modes of Operations (Internet Security)](2023-09-18-symmetric-key-cryptography-2.md#Modes%20of%20Operations).
Additional explanation available in [Modes of Operations (Internet Security)](2023-09-18-symmetric-key-cryptography-2.md#modes-of-operations).
### 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/is-03-ecb-encryption.png#)
- ECB mode encrypts each block with the same key.
- Blocks are independent of each other.
@@ -139,7 +139,7 @@ Additional explanation available in [Modes of Operations (Internet Security)](20
### 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/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**.
@@ -190,7 +190,7 @@ 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/is-03-ctr-encryption.png#)
Let $F : \mathcal{K} \times X \rightarrow X$ be a secure **PRF**.