# Dynamic Password > Dynamic Password means a unique One Time Password (OTP) generated by a [device] for each unique [identifier] **Term:** Dynamic Password **Last updated:** 2026-07-29 ## Definition ## What Dynamic Password Means in a Contract A Dynamic Password is a temporary, single use credential generated automatically for each authentication attempt, rather than a fixed word or phrase chosen once and reused. In a contract, the term is used to describe a specific authentication method that parties agree to accept, require, or support when granting access to systems, data, or transactions. It is contrasted with static passwords, which remain valid until manually changed. When a contract references a Dynamic Password, it is generally allocating responsibility for how identity verification will occur during the term of the agreement. This might appear in provisions governing account access, remote system logins, financial transaction approvals, or two factor authentication requirements. The clause typically ties the generation and validation of the password to a defined mechanism, such as a hardware token, mobile application, or SMS delivery system. Because Dynamic Passwords expire quickly or are valid for only one use, contracts often treat them as a stronger security control than reusable credentials. This distinction matters when drafters are allocating liability for unauthorized access or specifying minimum security standards that a vendor or counterparty must meet. ## How Dynamic Password Is Defined or Measured A workable contractual definition of Dynamic Password usually identifies three elements: the generating device or system, the unique identifier the password is tied to, and the validity window during which the password can be used. Common phrasing describes it as a code generated by a device for each unique identifier, such as a user account, transaction ID, or session token. Measurement in practice often focuses on expiry and uniqueness. A password that can be reused after its first use, or that remains valid indefinitely, would not meet the technical definition of dynamic. Contracts sometimes specify a maximum validity period, such as a short number of minutes, or require that the password be invalidated immediately after a successful login or transaction. - Generation method: hardware token, software authenticator, or SMS/email delivery - Uniqueness: tied to a specific user, device, or transaction - Validity: single use or time limited before automatic expiry These technical details are frequently left to a referenced policy document rather than the main body of the agreement, which keeps the contract flexible as authentication technology evolves. ## Where Dynamic Password Appears in Agreements Dynamic Password clauses commonly appear in technology services agreements, software licensing terms, data processing agreements, and outsourcing contracts where remote access to systems is contemplated. It is also relevant in financial services agreements where transaction authorization depends on multi factor verification. The term frequently surfaces alongside broader security obligations, such as a requirement to maintain a documented