The language of cryptography plaintext VA B→ plaintext ciphertext Encryption Decryption algorithm algoritnm channe Alice Tr symmetric key crypto: sender, receiver keys identical public-key cryp to: encry ypt key public, decrypt key secret 7: Network Security 77: Network Security 7 The language of cryptography symmetric key crypto: sender, receiver keys identical public-key crypto: encrypt key public, decrypt key secret Figure 7.3 goes here plaintext plaintext ciphertext K A K B