Password Phrase Generator

This tool generates phrase-based passwords (passphrases) to provide high security with memorability. It targets individual users, security-conscious employees, IT admins, and developers integrating passphrase generation into workflows. Use it when you need stronger entropy than simple random characters, while maintaining human recall. It supports policy-driven formatting and offline usage to avoid external data exposure. Assumption: users prefer memorable word-based phrases over purely random characters, with controllable length and formatting.
Core Logic & Features: Domain capabilities include word-list based phrase generation, optional separators, capitalization rules, and optional digit substitutions. Required features: select word_count, provide a word list source, choose a separator, and set basic formatting. Optional/advanced features: multiple dictionaries, custom rules (capitalization patterns, numeric substitutions), export options, offline mode, and policy-aligned constraints (minimum entropy, maximum length).
Inputs & Outputs: Inputs: word_list (array of strings or reference to a dictionary), word_count (integer), separator (string, e.g., ' ', '-', ''), capitalization (none | capitalize_each | random_capitalization), include_digits (boolean), allowed_characters (string), min_entropy (float). Outputs: passphrase (string), entropy_estimate (bits), length (integer), formatting_details (object).
Algorithms & Calculations: Entropy ≈ log2(N^k), where N is the number of unique words available and k is word_count; if digits or substitutions are enabled, effective entropy adjusts by the number of plausible substitutions. The tool provides an entropy estimate and a recommended minimum length based on configured options. No network queries are performed in offline mode.
Error & Edge Cases: Missing inputs default to safe values (e.g., word_count = 4, separator = ' '). If word_list is empty or contains duplicates only, the tool returns an error condition. Extremely large word_count or long outputs may exceed target storage limits; provide warnings and suggest reducing length. External dictionary references should be validated for format and encoding. Locale-specific word lists are not enforced unless provided by the user.
Industry/Region & Localization: English word lists are assumed by default. If localization is required, supply a locale-specific word list and adjust capitalization and separators accordingly. Entropy calculations remain probabilistic and depend on the size of the provided dictionary rather than a fixed standard.
Assumptions & Exclusions: Assumes the user desires human-memorable passphrases with acceptable entropy. Excludes UI interactions, credential storage, and service-specific password requirements. It does not store inputs or generated passphrases by default unless explicitly configured.