A security module for a radio telephone prevents a KEY code stored in a non-volatile memory from being read out for illicit use. The security module deletes the KEY code stored in the memory when accessed from the outside. Hence, although a KEY code can be written to the memory or the operation of the...http://www.google.fr/patents/US5150412?utm_source=gb-gplus-shareBrevet US5150412 - Security module for radio telephone
