Patent ID: 9047449
Filing Date: 2015-06-02
Classification: G06F,H04L

Abstract:
1. A method for entity authentication in a resource-limited network, characterized in comprising: sharing a Pre-Shared key (PSK) between the entity A and the entity B, sending, by an entity A, an authentication request message to an entity B, wherein the authentication request message comprises SN1 obtained in such a manner that the entity A generates a random number N1 and calculates SN1=N1□PSK, wherein the symbol ‘□’ represents a bitwise exclusive or operation; sending, by the entity B, an authentication response message to the entity A after receiving the authentication request message sent by the entity A, wherein sending, by the entity B, the authentication response message to the entity A specifically comprising: determining, by the entity A, the validity of the entity B according to the received authentication response message; wherein determining, by the entity A, the validity of the entity B according to the received authentication response message specifically comprising: after receiving, by the entity A, the authentication response message sent by the entity B, firstly, calculating, by the entity A, RN1=SRN1⊕PSK, obtaining N1′ by reversing the bit sequence of RN1 tailfirst, and determining whether N1′ is equal to the N1 generated by the entity A, wherein if N1′ is not equal to N1, the entity A discards the authentication response message; if N1′ is equal to N1, the entity A determines that the entity B is valid, which means that the entity A performs a successful authentication on the entity B; wherein the entity A and B are devices.