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A Simple Guide to Replay Attacks

6 min readSep 12, 2023

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Cyber Security Replay Attack
Credit: Canva

You might think your conversations and messages transmitted on the internet are secure.

But hackers are also getting smarter.

They have sneaky ways to capture and use the data.

Replay attacks involve the reuse of captured data by an attacker at a later point in time. This allows hackers to replay intercepted messages for their benefit. These attacks can compromise the security of passwords and undermine response protocols.

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Replay attack diagram representation
By Author

Imagine this: a hacker intercepts your login request and replays it to gain unauthorized access to your account by stealing your password and session tokens.

Scary, right?

Replay attacks exploit vulnerabilities in communication protocols, tricking systems into accepting repeated or outdated messages as valid.

The attacker can compromise the client’s password scheme. By replaying the original message or conversation, attackers can impersonate the user’s identity and make unauthorized requests on your behalf.

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Lokajit Tikayatray
Lokajit Tikayatray

Written by Lokajit Tikayatray

20+ years building tech and leading teams. Sharing hard-earned lessons on engineering, AI & leadership to help others grow and succeed — lokajittikayatray.com