Key pair generation method and data transmission method of block chain transaction network

The embodiment of the invention discloses a key pair generation method and a data transmission method of a block chain transaction network. The key pair generation method comprises the following steps: generating a system parameter matrix X and disclosing the system parameter matrix X to each node in a network; each node determines a secret key according to the system parameter matrix X; and constructing a key matrix based on the secret key, and calculating a public key according to the key matrix. The data transmission method comprises the following steps: a sending node N1 encrypts and sends transaction data by using a public key of the sending node N1 and a public key of a receiving node N2; the receiving node N2 decrypts the encrypted transaction data by using the public key of the sending node N1 and the secret key of the receiving node N2; wherein the public key and the secret key are both generated according to the method. According to the method, security encryption data transmission on multiple links