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Merge pull request #2544 from enkore/docs/ids-chunklayout
docs/data structures: add chunk layout diagram
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3 changed files with 4 additions and 3 deletions
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@ -451,9 +451,10 @@ Encryption
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AES_-256 is used in CTR mode (so no need for padding). A 64 bit initialization
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vector is used, a MAC is computed on the encrypted chunk
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and both are stored in the chunk.
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The header of each chunk is: ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``.
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Encryption and MAC use two different keys.
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and both are stored in the chunk. Encryption and MAC use two different keys.
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Each chunk consists of ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``:
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.. figure:: encryption.png
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In AES-CTR mode you can think of the IV as the start value for the counter.
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The counter itself is incremented by one after each 16 byte block.
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docs/internals/encryption.png
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docs/internals/encryption.vsd
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