Quantum computers won’t break the internet tomorrow… but they will break your email security sooner than you think. Today, cybercriminals and state-sponsored groups are quietly collecting encrypted emails in bulk. They know they can’t crack the encryption today. That’s fine. They don’t need to. They’re playing the long game. This tactic has a name: Store-Now-Decrypt-LaterRead More The post Post-Quantum Cryptography for DKIM, PGP, and S/MIME: Quantum Threat to Email Security appeared first on EncryptedFence by Certera - Web & Cyber Security Blog.

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Quantum computers pose an imminent threat to email security by breaking RSA and ECC encryption used in DKIM, PGP, and S/MIME. Attackers are already collecting encrypted emails through Store-Now-Decrypt-Later tactics, waiting for quantum computers to crack them. NIST-standardized post-quantum cryptography algorithms like CRYSTALS-Kyber and CRYSTALS-Dilithium offer quantum-resistant alternatives. Organizations should adopt hybrid cryptography combining classical and PQC algorithms, inventory their RSA/ECC usage, test PQC libraries, and update security policies now. Migration challenges include larger key sizes, compatibility issues with legacy systems, and PKI infrastructure overhauls, but early preparation is critical before quantum decryption becomes practical.

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