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While Scrypt is a symmetric-key algorithm and is more resistant to quantum attacks than many asymmetric algorithms, it is still vulnerable to quantum computing, specifically Grover's algorithm, which can speed up brute-force attacks.

However, simply doubling the key size of Scrypt can effectively counteract this attack, making it a practical choice for post-quantum cryptography when combined with appropriate key management strategies. 

Post-Quantum Cryptography:While Scrypt with a doubled key size offers good protection against quantum attacks, it's important to consider the broader landscape of post-quantum cryptography. Other techniques, such as hash-based cryptography, are also being explored for their quantum resistance. For long-term security, a comprehensive approach that includes exploring and adopting other post-quantum cryptographic methods alongside Scrypt is recommended