What are the differences between symmetric and asymmetric encryption algorithms?

Main differences between symmetric and asymmetric encryption:

• Keys:

  • Symmetric encryption uses the same key for encryption and decryption.
  • Asymmetric encryption uses a pair of keys: a public key (for encryption) and a private key (for decryption).

• Speed:

  • Symmetric algorithms are generally faster and more efficient for large data volumes.
  • Asymmetric algorithms are slower and are often used for key exchange or digital signatures.

• Security:

  • Symmetric encryption requires secure key transmission.
  • Asymmetric encryption solves the key transmission problem, as the public key can be freely distributed.

Example in Python using the cryptography library (AES symmetric encryption):

from cryptography.fernet import Fernet

key = Fernet.generate_key()
cipher = Fernet(key)

message = b"Secret message"
encrypted = cipher.encrypt(message)
decrypted = cipher.decrypt(encrypted)

print(encrypted)
print(decrypted)

Asymmetric encryption is usually implemented using RSA or ECC.