The safety of animal products has always been the focus of people's attention, especially the frequent occurrence of food safety problems in recent years, which has caused a series of bad social impact, and the traceability system of the whole industry chain is a solution to the food safety problem. Based on the analysis of the problems existing in the application of traditional traceability system, we combine the advantages of blockchain and Internet of Things technology. This paper proposes a framework of livestock products traceability system based on blockchain and Internet of Things, and discusses the key technologies of system implementation to ensure the integrity, reliability and security of traceability information from the technical level. The system is an effective solution to enhance the reliability of traceability information and ensure the integrity of information.

Signal processing on multi-core Central Processing Unit (CPU) is one of the directions of software radio development. It is necessary to study the parallelization method of signal processing algorithm to make full use of multi-core CPU. Computational decomposition method is applicable to most highly serial signal processing algorithms, and its implementation method is multi-core pipeline. The real-time performance of multi-core pipeline and serial method is analyzed and compared, and a distributed adaptive thread synchronization method is studied. Combined with practical signal processing, the real-time performance of serial method and multi-core pipeline is tested, results show that throughput rate of multi-core pipeline is 2.1 times that of serial method, the processing power is greatly improved.

A public-key cryptosystem using orthogonal product states is presented. It is based on the non-locality of some orthogonal product states in an untangled two-particle quantum system. Every user creates a group of two-particle quantum systems and shares them with a key management center (KMC) in which the first particle of the two-particle systems are held by the user and the second particle of the two-particle systems are held by KMC. This is the user's (private key, public key) pair. Two users can exchange secret message by this cryptosystem. The laws of quantum physics guarantees that this cryptosystem has unconditional security. There are no entangled states needed in this public-key cryptosystem. Moreover both users and KMC needn't perform complex quantum operations except quantum measurements on a particle or a two-particle system. So the public-key cryptosystem is feasible to implement by today's technology. One orthogonal product quantum system contributes three bits to the key. So the cryptosystem has a high channel capacity.

A quantum public-key cryptosystem without quantum storage for public-keys is provided. In traditional quantum public-key cryptosystems the public key of a user is a set of quantum systems. There is a key mangement center (KMC) which needs to keep the public keys of all users for a long time to satisfy communication requirments between users. But it's very difficult to keep quantum systems for a long time beacuse quantum system will undergo decoherence with time. This is a big obstacle for quantum public-key crytosystems when they are applied in practice. This quantum public-key cryptosystem can solve this problem. A user keeps a state sequence and a binary string in the key management center called the source key which is only a piece of classical information. If one user A wants to have another user B to get a secret message, KMC creates a sequence of quantum systems according to the latter one's source key, which is just the user's (public key, private key) pair. Then the two users can acomplish secure communications with KMC's assistance. On the otherhand users can also perform message authentication on the messages to guarantee that the messages can't be forged or distorted. In this cryptosystem KMC needs no quantum storage for public keys, which greatly reduces the technical difficulities of key management and secret communication. Moreover any two users needn't keep a quantum channel between them. Therefore to realize and apply this quantum public-key cryptosystem is much more easier than traditional quantum public-key cryptosystems.