A block cipher processes data in fixed-length groups called _____.
Answer
blocks
Explanation
### Why this is right
A block cipher divides its input into fixed-length units called blocks and transforms each unit using a key. The input and output blocks have the same size.
### The concept
Block processing differs from stream processing, which handles individual digits or units one at a time. To encrypt a message longer than a block, the cipher uses a mode of operation that determines how blocks relate to one another. The block size does not tell you the key size; those are distinct properties.
### Terms
- **Block**: A fixed-length group of bits processed by a block cipher.
- **Mode of operation**: A set of rules for applying a block cipher to longer messages.
### Remember
A block cipher works on blocks, while a stream cipher works unit by unit.
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