What term describes a fundamental cryptographic building block used within a larger system?

What term describes a fundamental cryptographic building block used within a larger system?

• A. Cipher
• B. Cryptographic primitive
• C. Hash function
• D. Key exchange

Answer: (B)

Fundamental cryptographic building blocks are called cryptographic primitives. These are the basic algorithms or constructs security systems are built from, each designed to perform a specific, well-defined task with security properties that can be combined to form larger protocols and schemes. Examples include block ciphers, hash functions, MACs, and digital signatures. By mixing and layering these primitives, a system can provide confidentiality, integrity, authenticity, and other security goals. This term fits best because it captures the idea of a general building block used inside bigger systems. A cipher is a concrete encryption method and is indeed a type of primitive, but the question points to the broader category. A hash function is another primitive, but again it’s describing a specific kind rather than the overarching concept. A key exchange is a protocol, outlining steps to establish a shared secret, not a primitive.

Fundamental cryptographic building blocks are called cryptographic primitives. These are the basic algorithms or constructs security systems are built from, each designed to perform a specific, well-defined task with security properties that can be combined to form larger protocols and schemes. Examples include block ciphers, hash functions, MACs, and digital signatures. By mixing and layering these primitives, a system can provide confidentiality, integrity, authenticity, and other security goals.

This term fits best because it captures the idea of a general building block used inside bigger systems. A cipher is a concrete encryption method and is indeed a type of primitive, but the question points to the broader category. A hash function is another primitive, but again it’s describing a specific kind rather than the overarching concept. A key exchange is a protocol, outlining steps to establish a shared secret, not a primitive.