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Encryption & Ciphers
AP CSP · Unit 2: The Internet
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Cipher:
Caesar
Key/Shift:
3
Mode:
Encrypt
Plaintext
↓ Encrypt ↓
Shift: 3
Ciphertext
CIPHER WHEEL
Input Text
HELLO WORLD
Shift / Key Value
3
Cipher Type
Caesar
Vigenère
Atbash
Vigenère Keyword
KEY
Mode
Encrypt
Decrypt
Brute Force
Show All 25 Shifts
Analysis
Quick Quiz
▼
1. A Caesar cipher with shift 3 turns 'A' into:
B
C
D
Z
2. Symmetric encryption means:
No key is needed
Same key encrypts and decrypts
Two different keys are used
Data cannot be decrypted
3. Caesar cipher's main weakness is:
It only works with numbers
Only 25 possible keys — easy to brute force
It requires a computer
It changes the message length
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