ReplaySchutzmeldung

ReplaySchutzmeldung is a German term that translates to "replay protection message." It is a concept commonly found in cryptography and secure communication protocols. The primary function of a replay protection message is to prevent attackers from intercepting and re-sending valid messages to a recipient at a later time. This type of attack, known as a replay attack, can have serious consequences, such as authorizing duplicate transactions or granting unauthorized access.

To counter replay attacks, a replay protection message typically incorporates a mechanism to detect and reject repeated messages. One common method is the use of timestamps. Each message is assigned a timestamp, and the recipient only accepts messages within a certain time window. Messages with timestamps that are too old or too far in the future are discarded. Another approach involves using sequence numbers. A unique, monotonically increasing sequence number is assigned to each message. The recipient keeps track of the last received sequence number and rejects any message with a sequence number that is not higher than the last one.

In practice, replay protection is implemented in various protocols, including secure network protocols like TLS/SSL, and in secure messaging systems. The specific implementation details can vary depending on the protocol and its security requirements. The goal remains the same: to ensure the integrity and authenticity of communications by preventing malicious retransmissions of previously valid data.