I know that IND-CPA is a security goal, which is defined as the inability of an attacker to distinguish two ciphertext of some arbitrary chosen plaintexts. Unfortunately i havent found a good definition of OW-CCA, but i assume it has something to do with an Oracle and Chosen Ciphertexts. So in my understanding OW-CCA is defined as the inability of an attacker to find out the key by chosing an arbitrary number of Ciphertexts and letting the Oracle decrypt these.
In IND-CPA the Attacker has the ability encrypt chosen plaintexts, which basically anyone can do. In OW-CCA, the Attacker can reverse the ciphertexts to plaintexts and is dependant on the oracle
Since the attacker has less power in IND-CPA the security goal is more easily achieved, which makes the attacker model weaker.
Is that correct?