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Leopard has improvements in security over Tiger OS X 10.4 in a number of ways. Ultimately these enhancements help not only to provide better defenses from attack, but also better internal resiliency if an attack is successful.
* Time Machine - Data is now more easily backed up which will ensure the security of
* Buffer Overflows - Leopard implements Library Randomization similar to Windows Vista in order to help prevent buffer overflow vulnerability exploitation. Previously the memory locations for system data were set, and a buffer overflow could easily rewrite this information by just knowing the memory address. Now that it is variable, it is a great deal more difficult to use a buffer overflow to run a virus.
* Application Signing - Used to verify the authenticity of a program and to ensure it has not been tampered with to run a virus.
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