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PERMITTED LEADS, SIGNALS AND DISCARDS

All systems of leads, signals and discards are permitted unless they are “encrypted”. It is very, very unlikely that you play encrypted signals because they are prohibited by nearly every Regulating Authority (such as the WBF and EBU etc etc). Here is the WBF definition of encrypted signals copied from their Systems Policy page on their web site:

2.5 Encrypted Signals

Additional to the restrictions on bidding methods and conventions above, players may not use signalling methods by which the message or messages conveyed by the signals are hidden from the declarer because of some key available only to the defenders (i.e. encrypted signals are not allowed)