Cryptography
Encryption protocols
Symmetric | Asymmetric |
---|---|
|
|
. System-1 System-2 #Encryption decryption download [data encrypted] -----> [data decrypted] - with public2 key - with private2 key #Signing [data encrypted] -----> [data decrypted] - with public2 key - with private2 key - signed with private1 key - verified signature with public1 key #Note, where needed the public key exchange happen, eg. via CA distribution process or protocol initialisation etc.
- Signing
- if you sign anything with private key, the only way to verify the signature is to decrypt with the matching public key.
SSL and TLS
Communication via SSL FTP,SMTP, HTTP operate at Application Layer, but when we securing with SSL (SSL wrapper) we put cryptographic wrapper around the communication at the Transport Layer
HTTP,FTP,SMTP ----- 7.Application 6.Presentation 5.Session SSL Wrapper ------ 4.Transport 3.Network 2.Data Link 1.Physical