How Does the Concept of a “Trapdoor Function” Relate to Cryptographic Security?
A trapdoor function is a function that is easy to compute in one direction but extremely difficult to reverse without a piece of secret information, the "trapdoor." While SHA-256 is a one-way function, it is not a trapdoor function because there is no secret key to reverse it. Trapdoor functions are mainly used in public-key cryptography, like RSA, not in hashing.
Glossar
Trapdoor Functions
Function ⎊ Trapdoor functions, within the context of cryptocurrency, options trading, and financial derivatives, represent a class of cryptographic algorithms exhibiting asymmetric properties ⎊ specifically, ease of computation in one direction and computational intractability in the reverse.
Trapdoor Function
Function ⎊ A trapdoor function is a mathematical function that is easy to compute in one direction but extremely difficult to compute in the reverse direction without a specific piece of secret information, known as the trapdoor.
Easy to Compute
Efficiency ⎊ The concept of being easy to compute refers to a function or algorithm that requires minimal computational resources and time to execute in the forward direction.