Diffie-Hellman
Diffie-Hellman (DH) is a protocol that allows two mutually unknown parties to establish a shared secret over an insecure communication channel.
Elliptic Curve Cryptography
ECC offers equivalent security to RSA but with significantly smaller key sizes, making it more efficient. Ed25519 is a popular ECC-based digital signature scheme.
RSA
RSA (Rivest-Shamir-Adleman) is one of the first and most widely used asymmetric cryptographic systems for secure data transmission.