Placing SLH-DSA in the TLS server leaf certificate causes orders-of-magnitude higher handshake latency and server compute cost than confining it to upper certificate layers while using ML-DSA at the leaf.
Module-Lattice-Based Digital Signature Standard
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Signature Placement in Post-Quantum TLS Certificate Hierarchies: An Experimental Study of ML-DSA and SLH-DSA in TLS 1.3 Authentication
Placing SLH-DSA in the TLS server leaf certificate causes orders-of-magnitude higher handshake latency and server compute cost than confining it to upper certificate layers while using ML-DSA at the leaf.