信息安全(04) Introduction to Cryptography Public Key Cryptography, RSA 復大软件学院 LiT
LiJT 1 信息安全（04） Introduction to Cryptography - Public Key Cryptography, RSA
eo Public Key Cryptography Principles of Public-Key Cryptos ystems · The rsa algorithm 復大软件学院 LiT
LiJT 2 Public Key Cryptography • Principles of Public-Key Cryptosystems • The RSA Algorithm
Cee Review: Symmetric Cipher Model Secret key shared by Secret key shared by sender and recipient sender and recipient Transmitted ciphertext Plaintext Plaintext Input Encryption algorithm Decryption algorithm output (e.g, DES) (reverse of encryption algorithm) Bob Alice 3 復大软件学院 LiT
LiJT 3 Review: Symmetric Cipher Model Bob Alice
想 Symmetric Cryptography traditional symmetriclsecret/single key cryptography uses one key shared by both sender and receiver if this key is disclosed communications are compromised also is symmetric, parties are equal 復大软件学院 LiT
LiJT 4 Symmetric Cryptography • traditional symmetric/secret/single key cryptography uses one key • shared by both sender and receiver • if this key is disclosed communications are compromised • also is symmetric, parties are equal
lot Review: Symmetric Cipher Model Secure channel Secret key shared by Secret key shared by sender and recipient sender and recipient Transmitted ciphertext Plaintext Plaintext Input Encryption algorithm Decryption algorithm output (e.g, DES) (reverse of encryption algorithm) Bob Alice 5 復大软件学院 LiT
LiJT 5 Review: Symmetric Cipher Model Secure channel Bob Alice