Alice posts a key for encrypting that anyone can access. Bob uses that key to encrypt a message, then sends it to Alice. When Alice receives the message, she decrypts it using a private key. What kind of encryption process is this

Public key encryption

Explanation:

DescriptionPublic-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys which may be disseminated widely, and private keys which are known only to the owner.