Huawei Technologies Co., Ltd.
Encryption method, decryption method, and related apparatus
In order to provide confidentiality protection, an encryption method, a decryption method, and related apparatuses are provided. An encryption device generates a first initial layer-3 message. The first initial layer-3 message includes a first part and a second part. The device generates a keystream for encrypting the first initial layer-3 message. The device performs an exclusive OR operation on the keystream and the first initial layer-3 message to generate a second initial layer-3 message. The second initial layer-3 message includes an encrypted first part of the first initial layer-3 message, an unencrypted second part of the first initial layer-3 message, and an encryption indication indicating that the first part of the first initial layer-3 message is encrypted. The device transmits the second initial layer-3 message to a network device. Small data comprised in the second initial layer-3 message is protected by the encryption.
HUAWEI TECHNOLOGIES CO., LTD.
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Lijia Jing
Zhang Chen