file-format.md: list full block overhead
For large files, the overhead will be 0.78125 %.
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@ -12,6 +12,7 @@ Data block
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1-4096 bytes encrypted data
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1-4096 bytes encrypted data
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16 bytes GHASH
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16 bytes GHASH
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Full block overhead = 32/4096 = 1/128 = 0.78125 %
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Example: 1-byte file
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Example: 1-byte file
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--------------------
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