The lesson describes the Data Encryption Standard (DES) as using a 56-bit key and a 64-bit block.
Answer
true
Explanation
### Why this is right
The lesson gives the Data Encryption Standard (DES) key size as 56 bits and its block size as 64 bits. It also notes that DES was broken in 1998, which is why these figures should not be mistaken for a recommendation to use it today.
### The concept
A key size is the number of bits in the secret key. A block size is the number of bits processed as one block by a block cipher. They describe different properties, so a 56-bit key can control the transformation of a 64-bit block. The lesson contrasts DES with the Advanced Encryption Standard (AES), which it presents with a 128-bit block and a 128-bit key.
### Terms
- **DES**: Data Encryption Standard, a symmetric block cipher described in the lesson as using a 56-bit key and 64-bit blocks.
- **AES**: Advanced Encryption Standard, the newer standard discussed in the lesson.
- **Bit**: A binary digit that has a value of 0 or 1.
### Remember
Key size and block size are separate measurements.
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