Usage of Key Pairs Key Pairs for Encryption Encrypt with public key Decrypt with private key Key Pairs for Signature Signed with private key Verify with public key 復大辱软件学院 LiJT
LiJT Usage of Key Pairs • Key Pairs for Encryption Encrypt with public key Decrypt with private key Signed with private key Verify with public key u Key Pairs for Signature
Outline Public-key Technology Review Why do we need PKi Digital Certificate Format Composition of PKI PKI Trust Relationship Application of PK 復大辱软件学院 LiJT
LiJT Outline • Public-key Technology Review • Why do we need PKI • Digital Certificate Format • Composition of PKI • PKI Trust Relationship • Application of PKI
Why do we need PKI Public key technology How to provide digital signature How to achieve non- repudiation service How to establish a connection between the public key and the identity How can we be sure that this is someone s public key Public key permissions How to manage public keys Solution certificate Associate the public key with an identity through a certificate 復大辱软件学院 LiJT
LiJT Why do we need PKI • Public key technology – How to provide digital signature – How to achieve non-repudiation service – How to establish a connection between the public key and the identity • How can we be sure that this is someone's public key • Public key permissions – How to manage public keys • Solution：certificate – Associate the public key with an identity through a certificate
More details Ideas are consistent with our real world solutions Certificate: ID card Degree certificate driver license A trusted third party 復大辱软件学院 LiJT
LiJT More details • Ideas are consistent with our real world solutions – Certificate: ID card, Degree certificate , driver license… – A trusted third party
More details Ideas are consistent with our real world solutions PKI: Certificate: ID card Degree certificate Digital certificate driver license a trusted third party o ca Certification Authority 復大辱软件学院 LiJT
LiJT More details • Ideas are consistent with our real world solutions – Certificate: ID card, Degree certificate , driver license… – A trusted third party • PKI： – Digital certificate – CA （Certification Authority）