gen-state-block-versus-stream-ciphers-precisely-and-explain-why-71f9

State block versus stream ciphers precisely and explain why it matters in 2-3 sentences.

# Block vs Stream Ciphers **Block ciphers** encrypt fixed-size chunks of data (e.g., 128 bits) at a time, while **stream ciphers** encrypt data bit-by-bit or byte-by-byte as a continuous stream. **Why it matters:** Block ciphers require padding and modes of operation for variable-length data, making them more suitable for stored data, while stream ciphers excel at real-time communications where data arrives continuously. The choice affects performance, implementation complexity, and security properties—stream ciphers are typically faster for streaming applications but more vulnerable to key reuse, whereas block ciphers are more versatile but require careful mode selection to prevent patterns.