Standard Lemma guide

S-box

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈɛsˌbɒks/
  • US: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

A basic component of symmetric-key algorithms, which performs substitution, transforming one set of bits into another.

Definition source: English Wiktionary via Wiktextract

Topics: computing, cryptography, engineering, mathematics, natural-sciences, physical-sciences, sciences

Examples

  • In block ciphers, S-boxes are typically used to obscure the relationship between the key and the ciphertext.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Short for substitution box.