Adds an encryption algorithm to the list of allowed groupwise encryption algorithms.
If the list is not empty, then only access points that support one or more of the encryption algorithms in the list will be considered compatible with this connection.
| this | |
| group |
the encryption algorithm to add, one of "wep40", "wep104", "tkip", or "ccmp" |
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true if the algorithm was added to the list, false if it was already in the list |