Copy Rfid Intercom Key to Wristband?

Question

Cryptography

Gentlemen, I became interested in the topic after I tried to copy the key to the intercom from the master. He said he couldn't copy.
\(-~-)/
Here is a bracelet bought from ali for 50 rubles.
alishka
Question: how to encode a bracelet to open a regular intercom with minimal cost?

Answer 1

Both the intercom key and the bracelet with Ali are RFID tags.
Tags come in several ranges (LH - 125-134kHz, HF - 13.56MHz, UHF - 433 and 868MHz) and standards (EM Marine, Milfare). Outwardly, it is impossible to distinguish. Milfare and EM Marine UHF - unlikely. But LH and HF are very often used.
Reason:
1. The purchased bracelet has a different standard / frequency.
2. The purchased bracelet is not rewritable, i.e. it cannot be programmed with a new code read from the intercom key, the code is programmed at the factory.
PS I did not immediately see the link to ali - it clearly says that the bracelet is "read-only"
PPS Although it's strange - the review says that the programmer sees and programs the keys ... Then it's possible that the frequency of your original key is different.