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How To Make 600 In A Few Min.pdf _BEST_


When a biometric factor is used in authentication at AAL2, the performance requirements stated in Section 5.2.3 SHALL be met, and the verifier SHOULD make a determination that the biometric sensor and subsequent processing meet these requirements.




How to make 600 in a few min.pdf



When a biometric factor is used in authentication at AAL3, the verifier SHALL make a determination that the biometric sensor and subsequent processing meet the performance requirements stated in Section 5.2.3.


Verifiers SHALL require subscriber-chosen memorized secrets to be at least 8 characters in length. Verifiers SHOULD permit subscriber-chosen memorized secrets at least 64 characters in length. All printing ASCII [RFC 20] characters as well as the space character SHOULD be acceptable in memorized secrets. Unicode [ISO/ISC 10646] characters SHOULD be accepted as well. To make allowances for likely mistyping, verifiers MAY replace multiple consecutive space characters with a single space character prior to verification, provided that the result is at least 8 characters in length. Truncation of the secret SHALL NOT be performed. For purposes of the above length requirements, each Unicode code point SHALL be counted as a single character.


Verifiers SHALL store memorized secrets in a form that is resistant to offline attacks. Memorized secrets SHALL be salted and hashed using a suitable one-way key derivation function. Key derivation functions take a password, a salt, and a cost factor as inputs then generate a password hash. Their purpose is to make each password guessing trial by an attacker who has obtained a password hash file expensive and therefore the cost of a guessing attack high or prohibitive. Examples of suitable key derivation functions include Password-based Key Derivation Function 2 (PBKDF2) [SP 800-132] and Balloon [BALLOON]. A memory-hard function SHOULD be used because it increases the cost of an attack. The key derivation function SHALL use an approved one-way function such as Keyed Hash Message Authentication Code (HMAC) [FIPS 198-1], any approved hash function in SP 800-107, Secure Hash Algorithm 3 (SHA-3) [FIPS 202], CMAC [SP 800-38B] or Keccak Message Authentication Code (KMAC), Customizable SHAKE (cSHAKE), or ParallelHash [SP 800-185]. The chosen output length of the key derivation function SHOULD be the same as the length of the underlying one-way function output.


To facilitate secure reporting of the loss, theft, or damage to an authenticator, the CSP SHOULD provide the subscriber with a method of authenticating to the CSP using a backup or alternate authenticator. This backup authenticator SHALL be either a memorized secret or a physical authenticator. Either MAY be used, but only one authentication factor is required to make this report. Alternatively, the subscriber MAY establish an authenticated protected channel to the CSP and verify information collected during the proofing process. The CSP MAY choose to verify an address of record (i.e., email, telephone, postal) and suspend authenticator(s) reported to have been compromised. The suspension SHALL be reversible if the subscriber successfully authenticates to the CSP using a valid (i.e., not suspended) authenticator and requests reactivation of an authenticator suspended in this manner. The CSP MAY set a time limit after which a suspended authenticator can no longer be reactivated.


Multiple factors make successful attacks more difficult to accomplish. If an attacker needs to both steal a cryptographic authenticator and guess a memorized secret, then the work to discover both factors may be too high.


These considerations should not be read as a requirement to develop a Privacy Act SORN or PIA for authentication alone. In many cases it will make the most sense to draft a PIA and SORN that encompasses the entire digital authentication process or include the digital authentication process as part of a larger programmatic PIA that discusses the service or benefit to which the agency is establishing online.


Accessibility differs from usability and is out of scope for this document. Section 508 was enacted to eliminate barriers in information technology and require federal agencies to make their online public content accessible to people with disabilities. Refer to Section 508 law and standards for accessibility guidance.


Users should be encouraged to make their passwords as lengthy as they want, within reason. Since the size of a hashed password is independent of its length, there is no reason not to permit the use of lengthy passwords (or pass phrases) if the user wishes. Extremely long passwords (perhaps megabytes in length) could conceivably require excessive processing time to hash, so it is reasonable to have some limit.


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