I know that HTTPS helps to ensure security when data is being transferred from A to B, what I don’t understand is why an attacker can’t intercept the data is just decrypt it as HTTPS sounds to me as something “public”, wouldn’t that mean decryption is also publicly accessible?
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HTTPS uses a form of decryption known as asymmetric encryption. The key used to encrypt something is different from the key used to decrypt it. So you can publicize and share the public key with someone, allowing them to encrypt something and share it with you, but no one else will be able to decrypt it unless they have the private key, which only you have.
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