Narrowest internal width

{
  "id": "MLC-T-CYB-002778",
  "term": "Narrowest internal width",
  "field": "Cybersecurity",
  "definition": "The maximum amount of information from the input that can affect the output. For example, if f(x) = SHA-1(x) || 01, and x consists of a string of 1000 binary bits, then the narrowest internal width of f(x) is 160 bits (the SHA-1 output length), and the output width of f(x) is 162 bits (the 160 bits from the SHA-1 operation, concatenated by 01).",
  "references": [
    "NIST SP 800-90B",
    "NIST CSRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/cybersecurity/narrowest-internal-width/"
}