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# How strong is nfc password with 8 bytes? How much time needed to bruteforce it?

Associate

Hi Team,

How strong is 8 bytes NFC password given the fact that there is no lockout mechanism. Assuming an attacker with physical proximity tries to brute-force (try all combination) the password on nfc chip, How much time will be needed to crack the password? How to calculate the time it takes to perform one valid/invalid authentication attempt on nfc chip?

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ST Employee

Welcome @abhijeet_7, to the community!

Well, you can easily work that out for yourself: 2^64 = 1.845*10^19 codes, divided by an assumed 10000 brute force attacks per second = approx. 58.45 million years. Do you want to wait that long?

Regards
/Peter

3 REPLIES 3
ST Employee

Welcome @abhijeet_7, to the community!

Well, you can easily work that out for yourself: 2^64 = 1.845*10^19 codes, divided by an assumed 10000 brute force attacks per second = approx. 58.45 million years. Do you want to wait that long?

Regards
/Peter