Quantum computing poses a formidable threat to classical cryptographic systems, particularly those safeguarding blockchain-based transactions and user privacy. Conventional algorithms such as RSA and elliptic curve cryptography are vulnerable to quantum attacks through Shor's and Grover's algorithms, jeopardizing the long-term security of digital assets. To address these challenges, this paper proposes a Lightweight Lattice-based Privacy Protection (LLPP) blockchain framework that integrates lattice-based digital signatures with a double encryption mechanism. The framework is designed to provide post-quantum security for transaction authentication while enhancing payment address privacy and reducing direct linkage under public observation, even in the presence of quantum-capable adversaries. A key challenge in deploying lattice-based cryptography on blockchain systems is the substantial storage overhead of signatures and public keys. LLPP addresses this by leveraging the InterPlanetary File System (IPFS) for off-chain storage, recording only 46-byte content identifiers on-chain while maintaining full verifiability. Comprehensive evaluations on the Substrate platform demonstrate that LLPP provides practical post-quantum authentication and privacy protection with signing and verification latencies below 2 milliseconds, making it practical for deployment in quantum-secure blockchain environments.

Soft grippers conform to the shape and surface properties of the objects to be grasped, effectively avoiding damage to soft and fragile items. Despite the variety of existing soft gripper designs, their structures lack sufficient flexibility for effectively grasping slender objects or operating in narrow spaces. To address these challenges, we propose a soft gripper with single-finger grasping capabilities, inspired by the structure of crab claws. The structural design and the fabrication method of the gripper are introduced, and the analytical bending model is derived. Experiments are conducted under typical operating conditions to validate the model, and the results indicate that the measured data are in good accordance with the predicted responses. Furthermore, a series of grasping experiments are carried out to test the single-finger grasping capabilities of the proposed soft gripper. The results indicate that the proposed soft gripper can efficiently and stably grasp slender or irregular objects with a single finger. In particular, it demonstrates suitability for operations in narrow spaces and shows potential for handling complex tasks. This innovative design effectively reduces the complexity of the system, while exhibiting promising capabilities in grasping slender or irregular objects and operating within restricted spaces.