Which comparison of the Advanced Encryption Standard (AES) and the Data Encryption Standard (DES) matches the lesson?

### Why this is right The lesson gives the Advanced Encryption Standard (AES) a 128-bit block and key. It gives the Data Encryption Standard (DES) a 64-bit block and a 56-bit key, and states that DES was broken in 1998. ### The concept AES and DES are symmetric block ciphers, not public-key methods or hashes. The lesson presents AES as the official standard adopted in 2001 and says there are no known practical attacks on it at the time of the material. That is a time-bounded statement from the lesson, not a guarantee that a cipher can never be attacked. ### The other options - **B. AES is presented with a 56-bit block and key; DES uses a 128-bit block and key.**: This swaps and misstates the sizes given in the lesson. - **C. AES is an asymmetric method, while DES is a hash function.**: Both are symmetric encryption algorithms; neither is a hash function. - **D. AES and DES are both described as public-key methods used only for digital signatures.**: The lesson discusses them as symmetric block ciphers, not signature-only public-key methods. ### Terms - **AES**: Advanced Encryption Standard, a symmetric block cipher described here with a 128-bit block and key. - **DES**: Data Encryption Standard, a symmetric block cipher described here with a 56-bit key and 64-bit block. - **Asymmetric encryption**: Cryptography using a public and private key pair. ### Remember A key size and a block size are different, and DES’s historical figures do not make it a current recommendation.