Actually, the removable memory would be more secure than main memory, even if secured using the same encryption system because you need physical access to the memory in the Blackberry to get the encryption algorithm and key. Without it, it would take breaking the encryption via a brute force method or a more sophisticated attack that would be beyond that available to most people. However, if the encryption method is weak and relies on the fact that access to the chip requires special skills as part of the security this would not be true.
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