Selecting Appropriate Cryptographic Algorithms Questions

For a given use case, understand how to select appropriate algorithms: Do we need symmetric or asymmetric encryption (or both)? What key length is appropriate? Are there standards we should follow (NIST, IETF)? Should we use authenticated encryption (like AES-GCM) or encrypt-then-MAC separately? Understand the security-performance trade-offs. Know why algorithm choice matters: outdated algorithms (DES), inappropriate algorithm for use case, or insufficient key length can all lead to compromise.