*/
private void checkKeyLength(Contact other) throws IllegalArgumentException {
KUID contactId = localhost.getId();
KUID otherId = other.getId();
if (contactId.lengthInBits()
!= otherId.lengthInBits()) {
throw new IllegalArgumentException(
"Bits: " + contactId.lengthInBits()
+ " vs. " + contactId.lengthInBits());
}
}