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The key SHALL be strongly protected against unauthorized disclosure by the use of access controls that limit access to the key to only those software components on the device requiring access. NIST is clear in its recommendations for password length. Conversely, some authenticatorsâ performance may improve â for example, when changes to their underlying standards increases their ability to resist particular attacks.The salt SHALL be at least 32 bits in length and be chosen arbitrarily so as to minimize salt value collisions among stored hashes. Replay resistance is in addition to the replay-resistant nature of authenticated protected channel protocols, since the output could be stolen prior to entry into the protected channel. Single-factor cryptographic software authenticators SHOULD discourage and SHALL NOT facilitate the cloning of the secret key onto multiple devices.Replacement of a lost (i.e., forgotten) memorized secret is problematic because it is very common. Nor should these guidelines be interpreted as altering or superseding the existing authorities of the Secretary of Commerce, Director of the OMB, or any other federal official. Digital identity presents a technical challenge because it often involves the proofing of individuals over an open network and always involves the authentication of individuals over an open network. The IAL would remain at IAL1.Session management is preferable over continual presentation of credentials as the poor usability of continual presentation often creates incentives for workarounds such as cached unlocking credentials, negating the freshness of the authentication event.Guidelines and considerations are described from the usersâ perspective.To prevent users from needing to reauthenticate due to user inactivity, prompt users in order to trigger activity just before (e.g., 2 minutes) an inactivity timeout would otherwise occur.Temporary secrets SHALL NOT be reused.As discussed above, the threat model being addressed with memorized secret length requirements includes rate-limited online attacks, but not offline attacks. This defeats the purpose of having a password in the first place.Many industries have had a frequent password change standard in place for years, so it may take some time before this new standard is commonly observed. It SHALL then wait for the secret to be returned on the secondary channel from the claimantâs out-of-band authenticator.Suspension, revocation, or destruction of compromised authenticators SHOULD occur as promptly as practical following detection. NIST 800-63 highlighted the current password requirements to meet the modern needs of today’s environment.How to combat this password problem? Keystroke logging, phishing, and social engineering attacks are equally effective on lengthy, complex passwords as simple ones. If a biometric is bound to the account, the biometric and associated physical authenticator SHOULD be used to establish a new memorized secret.The CSP SHALL require subscribers to surrender or certify destruction of any physical authenticator containing certified attributes signed by the CSP as soon as practical after revocation or termination takes place. In many cases, the options remaining available to authenticate the subscriber are limited, and economic concerns (e.g., cost of maintaining call centers) motivate the use of inexpensive, and often less secure, backup authentication methods. While both types of keys SHALL be protected against modification, symmetric keys SHALL additionally be protected against unauthorized disclosure.Limited availability of a direct computer interface like a USB port could pose usability difficulties. As this XKCD comic points out, complex password rules actually drive us to create predictable, easy-to-guess passwords (“password1!” anybody?)
The key SHALL be strongly protected against unauthorized disclosure by the use of access controls that limit access to the key to only those software components on the device requiring access. NIST is clear in its recommendations for password length. Conversely, some authenticatorsâ performance may improve â for example, when changes to their underlying standards increases their ability to resist particular attacks.The salt SHALL be at least 32 bits in length and be chosen arbitrarily so as to minimize salt value collisions among stored hashes. Replay resistance is in addition to the replay-resistant nature of authenticated protected channel protocols, since the output could be stolen prior to entry into the protected channel. Single-factor cryptographic software authenticators SHOULD discourage and SHALL NOT facilitate the cloning of the secret key onto multiple devices.Replacement of a lost (i.e., forgotten) memorized secret is problematic because it is very common. Nor should these guidelines be interpreted as altering or superseding the existing authorities of the Secretary of Commerce, Director of the OMB, or any other federal official. Digital identity presents a technical challenge because it often involves the proofing of individuals over an open network and always involves the authentication of individuals over an open network. The IAL would remain at IAL1.Session management is preferable over continual presentation of credentials as the poor usability of continual presentation often creates incentives for workarounds such as cached unlocking credentials, negating the freshness of the authentication event.Guidelines and considerations are described from the usersâ perspective.To prevent users from needing to reauthenticate due to user inactivity, prompt users in order to trigger activity just before (e.g., 2 minutes) an inactivity timeout would otherwise occur.Temporary secrets SHALL NOT be reused.As discussed above, the threat model being addressed with memorized secret length requirements includes rate-limited online attacks, but not offline attacks. This defeats the purpose of having a password in the first place.Many industries have had a frequent password change standard in place for years, so it may take some time before this new standard is commonly observed. It SHALL then wait for the secret to be returned on the secondary channel from the claimantâs out-of-band authenticator.Suspension, revocation, or destruction of compromised authenticators SHOULD occur as promptly as practical following detection. NIST 800-63 highlighted the current password requirements to meet the modern needs of today’s environment.How to combat this password problem? Keystroke logging, phishing, and social engineering attacks are equally effective on lengthy, complex passwords as simple ones. If a biometric is bound to the account, the biometric and associated physical authenticator SHOULD be used to establish a new memorized secret.The CSP SHALL require subscribers to surrender or certify destruction of any physical authenticator containing certified attributes signed by the CSP as soon as practical after revocation or termination takes place. In many cases, the options remaining available to authenticate the subscriber are limited, and economic concerns (e.g., cost of maintaining call centers) motivate the use of inexpensive, and often less secure, backup authentication methods. While both types of keys SHALL be protected against modification, symmetric keys SHALL additionally be protected against unauthorized disclosure.Limited availability of a direct computer interface like a USB port could pose usability difficulties. As this XKCD comic points out, complex password rules actually drive us to create predictable, easy-to-guess passwords (“password1!” anybody?)