*Keyfiles can be stolen without the user's knowledge
*Keyfiles can be stolen without the user's knowledge
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*Keyfiles can be damages or deleted (accidentally or be design) preventing access
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*Keyfiles can be damages or deleted (accidentally or intentionally) preventing access
*Storage media on which the keyfile is stored can be damaged or destroyed, making the keyfile potentially inaccessible, and therefore preventing access
*Storage media on which the keyfile is stored can be damaged or destroyed, making the keyfile potentially inaccessible, and therefore preventing access