Communication method and apparatus

A communication method, comprising:

• determining a third constellation diagram based on a received signal;
• determining a fourth constellation diagram based on the third constellation diagram, wherein the fourth constellation diagram comprises a set of fourth constellation points, the fourth constellation points in the set of fourth constellation points are obtained by decrypting corresponding third constellation points in a set of third constellation points in the third constellation diagram based on a second key, and a phase of the third constellation points in the set of third constellation points is different from a phase of the fourth constellation points in the set of fourth constellation points;
• and
• demodulating the signal based on the fourth constellation diagram.

A communication apparatus, comprising:

• a processor, wherein when the processor executes instructions, the communication apparatus is caused to:
• obtain a first constellation diagram, wherein the first constellation diagram comprises a set of first constellation points, the first constellation points in the set of first constellation points are obtained by encrypting corresponding second constellation points in a set of second constellation points in a second constellation diagram based on a first key, the second constellation points in the set of second constellation points are obtained by mapping to-be-sent data, and a phase of the first constellation points in the set of first constellation points is different from a phase of the second constellation points in the set of second constellation points;
• and
• send a signal based on the first constellation diagram.