STRUCTURE PRESERVING SIGNATURES WITH KEY BLINDING

Date

2025-7-02

Author

Çelik, Emircan

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While digital signatures serve to confirm message integrity and the identity of the signer, the inherent link between the public key and the signer’s identity can pose challenges in anonymized networks or applications focused on preserving privacy. Signatures with randomizable keys aim to disentangle the signer’s identity from their public key, thus preserving the signature’s validity. This approach ensures that the signature, even with a randomized key, maintains its verifiability without linking it to the signer’s identity. Although signatures with randomizable keys effectively main- tain privacy, additional structural improvements are necessary in specialized signa- ture schemes for complex cryptographic frameworks. Threshold structure- preserv- ing signatures offer a way to construct modular protocols while retaining the bene- fits of structure-preserving properties. Thus, the randomizable key version of it is essential for a wide range of applications, making it the foundation of this work. In this study, signatures with randomizable key principles combined with thresh- old structure-preserving signatures to build a strong cryptographic base for privacy- preserving applications. This foundation makes sure that signatures are valid while also being modular and unlinkable. Also we present a threshold structure-preserving signature variant with an hierarchical access structure.

Subject Keywords

SPS, Randomizable Key, Hierarchical Secret Sharing

URI

https://hdl.handle.net/11511/115559

Collections

Graduate School of Applied Mathematics, Thesis