Quantum-Secure Digital Signature

Decapsulation: The authors evaluate the time required for decrypting messages using different cryptographic schemes at Security Levels III and V. At Security Level III, HPPK-(64,1,1,2) is the fastest method, requiring 524 kilocycles to decrypt a message. At Security Level V, SPHINCS+ is the fastest, taking only 306 kilocycles to decrypt a message.
Conclusion: The study demonstrates that the choice of cryptographic scheme significantly affects the performance of key generation, encapsulation, and decapsulation. For low-security applications, HPPK-(32,1,1,2) and HPPK-(32,1,1,3) are ideal due to their fast key generation times. SPHINCS+ is the fastest scheme at Security Levels III and V for decryption. The findings of this study can help cryptographers select the most appropriate schemes based on their security requirements and performance constraints. By leveraging these insights, they can design more efficient and secure cryptographic systems to protect sensitive data in various applications.