message authentication code
时间: 2023-04-28 10:00:28 浏览: 50
消息认证码(Message Authentication Code,MAC)是一种用于验证消息完整性和真实性的技术。它是通过对消息进行加密和哈希运算来生成一个固定长度的值,该值可以用于验证消息是否被篡改或伪造。MAC通常用于保护网络通信、数字签名和数据完整性等方面。
相关问题
Bluetooth LE supports the ability to send authenticated data over an unencrypted ATT bearer between two devices with a trusted relationship. This is accomplished by signing the data with a Connection Signature Resolving Key (CSRK). The sending device places a signature after the Data PDU. The receiving device verifies the signature and if the signature is verified the Data PDU is assumed to come from the trusted source. The signature is composed of a Message Authentication Code generated by the signing algorithm and a counter. The counter is used to protect against a replay attack and is incremented on each signed Data PDU sent.
蓝牙低功耗支持在两个具有信任关系的设备之间通过未加密的ATT承载发送经过身份验证的数据。这是通过使用连接签名解析密钥(CSRK)对数据进行签名来实现的。发送设备在数据PDU之后放置签名。接收设备验证签名,如果签名验证成功,则假定数据PDU来自受信任的源。签名由签名算法生成的消息认证码和计数器组成。计数器用于防止重放攻击,并在发送每个已签名的数据PDU时递增。
redis NOAUTH Authentication required.
The error message "NOAUTH Authentication required" indicates that Redis requires authentication before allowing any operations. To resolve this issue, you need to provide the correct password or authentication token when connecting to Redis.
If you are using the Redis command-line interface (CLI), you can provide the password using the `AUTH` command followed by your password. For example:
```
AUTH your_password
```
If you are using a Redis client library in your code, you typically need to set the `password` or `auth` option when creating the connection. The specific method varies depending on the programming language and the Redis client library you are using.
Make sure to double-check the password or authentication token you are using, as Redis authentication is case-sensitive.