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Message: [QUOTE="me2, post: 443509, member: 3825"] A second method of prevention is by using cryptography. Rolling codes and challenge-response authentication (CRA) are commonly used to foil monitor-repetition of the messages between the tag and reader; as any messages that have been recorded would prove to be unsuccessful on repeat transmission. Rolling codes rely upon the tag's id being changed after each interrogation, while CRA uses software to ask for a cryptographically coded response from the tag. The protocols used during CRA can be symmetric, or may use public key cryptography.[76] [url]http://en.wikipedia.org/wiki/Radio-frequency_identification[/url] [/QUOTE]

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