One-Time Pad Password

This tool generates deterministic passwords from a master_secret and a one_time_pad, delivering reproducible credentials without server-side storage or network calls. It is intended for developers, security engineers, IT admins, and advanced users who need automation-friendly secrets for service accounts, CI/CD pipelines, and cross-device workflows. The inputs are kept entirely client-side, enabling offline operation and audit-capable derivations when compliant with policy.
Conceptually, a keystream is derived from the inputs and then mapped into the selected character set to form the password. At generation time, each password character is chosen by applying a modular index operation to a byte of the keystream, ensuring the final string uses only allowed characters and matches the requested length. A cryptographic primitive, such as HMAC-SHA256, can be used to produce the keystream deterministically from the inputs, pad, and optional salt and counter.
Audience value and differentiators: offline operation, reproducible outputs across devices with the same inputs, and auditable derivation without network activity. Optional salt and per-iteration counter allow variant passwords for different environments while retaining determinism for the same configuration. The approach does not require server storage and supports multiple pads to separate environments or projects.
Core features and use cases: required inputs (master_secret, one_time_pad, length) and optional controls (charset, salt, counter); outputs include the password and a lightweight strength estimate. Use cases include rotating credentials for automation, generating test or staging passwords locally, and sharing pads among trusted devices for controlled access. Assumptions include client-side operation and no data transmission.