ECB(Electronic Code Book) mode

□ ECB(Electronic Code Book)

○ ECB Encryption : En(P[i])

- Encryption(Current lain text block(P[i])) → Current ciphertext block(C[i])

○ ECB Decryption : De(C[i])

- Decryption(Current ciphertext block(C[i])) → Current plaintext block(P[i])

○ Plaintext block and ciphertext block is matched one-to-one
○ With just ciphertext, guessing the pattern is available
○ It is not suitable for data encryption

P.S. Symbol information

- En:Encryption / De:Decryption
- C:Cipher text / P:Plain text
- i:Each step(Ex. Current step:i / one Previous step:i-1 / one Next step:i+1)