Communication method and apparatus

A communication method, comprising:

• determining, by a second terminal, a second logical channel identifier (LCID) meeting a preset condition, wherein a second packet data convergence protocol (PDCP) entity of the second terminal is associated with two or more logical channels (LCHs);
• using, by the second terminal, the second LCID as an input parameter of a security algorithm of the second PDCP entity to perform security protection on a first data packet;
• and
• sending, by the second terminal, the first data packet on which security protection is performed to a first terminal, wherein the second LCID used by the second terminal to perform security protection on the first data packet is the same as a first LCID used as an input parameter by a first PDCP entity of the first terminal to parse the first data packet, and the first PDCP entity of the first terminal corresponds to the second PDCP entity of the second terminal.

A communication apparatus, comprising:

• at least one processor, and a memory configured to store instructions that, when executed by the at least one processor, cause the apparatus to:
• determine a first logical channel identifier (LCID) meeting a preset condition, wherein a first packet data convergence protocol (PDCP) entity of a first terminal is associated with two or more logical channels (LCHs);
• receive a first data packet from a second terminal, wherein security protection is performed on the first data packet using a second LCID as an input parameter of a security algorithm of a second PDCP entity of the second terminal;
• and
• parse the first data packet using the first LCID, wherein the preset condition met by the first LCID used by the first terminal to parse the first data packet is the same as a preset condition met by the second LCID used by the second terminal to perform the security protection on the first data packet.