Questions tagged [replay-attack]

Attacks that are based on recording an encrypted and/or signed communication and replaying it at a later time.

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10 votes
1 answer

Can I use a HMAC for Replay Attack protection?

I am considering a system where a small device accepts messages/commands from another device over a wireless channel. I am worried about replay attacks. The messages will be encrypted. What are ...
err's user avatar
  • 195
5 votes
0 answers

How can Alice and Bob safeguard their message exchanges against replay attacks?

Assume Alice and Bob communicate over an insecure channel using one-time perfectly-secret encryption together with one-time secure message authentication code. Say Eve has the ability to eavesdrop and ...
Nick's user avatar
  • 139
24 votes
3 answers

How does a rolling code work?

I have general questions regarding rolling codes. Basically there is a sender and a receiver. Both have a sequence generator. The receiver checks if the received sequence matches the newly generated. ...
matcauthon's user avatar
9 votes
1 answer

Replay attack prevention in connectionless UDP encrypted communication

What are the options for replay attack prevention when two parties exchange UDP messages. No connection or session is estabilished. Communicating parties have pre shared key that is used for ...
PanJanek's user avatar
  • 193