Cryptography is concerned with the construction of schemes that withstand any abuse.
These Foundations were developed mostly in the 1980s, in works that are all co-auth.
The design of cryptographic systems must be based on firm foundations, whereas ad hoc approaches and heuristics are a very dangerous way to go.
A cryptographic scheme is constructed so as to maintain a desired functionality, even under malicious attempts aimed at making it deviate from its prescribed behavior.
Cryptography is concerned with the construction of schemes that withstand any abuse