Cryptographic algorithms have a finite lifespan, as demonstrated by the deprecation of DES, RC4, and Triple DES over the decades. Quantum computers pose the next major threat, requiring AES key sizes to double to 256-bit and entirely new post-quantum algorithms to replace RSA. Crypto agility is the architectural approach to address this: instead of hardcoding cryptographic implementations throughout codebases, centralize them behind abstraction layers so algorithms can be swapped without disrupting systems. The practical path involves discovery (building a cryptographic bill of materials), evaluating weak or deprecated instances, prioritizing remediation, and refactoring toward modular, agile crypto design while updating for the quantum era.
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