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security strength

Abbreviations / Acronyms / Synonyms:

Bits of security

Definitions:

  A number associated with the amount of work (i.e., the number of operations) that is required to break a cryptographic algorithm or system.
Sources:
FIPS 186-5
NIST SP 800-175B Rev. 1

  A number associated with the amount of work (that is, the number of operations) that is required to break a cryptographic algorithm or system. In this policy, security strength is specified in bits and is a specific value from the set {80, 112, 128, 192, 256}.
Sources:
CNSSI 4009-2015 from CNSSI 1300

  See security strength.
Sources:
NIST SP 800-107 Rev. 1 under Bits of security

  A number associated with the amount of work (i.e., the number of operations) that is required to break a cryptographic algorithm or system. In this Recommendation, the security strength is specified in bits and is a specific value from the set {80, 112, 128, 192, 256}. Note that a security strength of 80 bits is no longer considered sufficiently secure.
Sources:
NIST SP 800-57 Part 1 Rev. 5

  A number associated with the amount of work (that is, the number of operations) that is required to break a cryptographic algorithm or system. If 2N execution operations of the algorithm (or system) are required to break the cryptographic algorithm, then the security strength is N bits.
Sources:
NIST SP 800-107 Rev. 1

  A number associated with the amount of work (e.g., the number of operations) that is required to break a cryptographic algorithm or system.
Sources:
NIST SP 800-102

  A number associated with the amount of work (that is, the number of basic operations of some sort) required to break a cryptographic algorithm or system. Security strength is often expressed in bits. If the security strength is S bits, then it is expected that (roughly) 2S basic operations are required to break the algorithm or system.
Sources:
NIST SP 800-133 Rev. 2

  A number associated with the expected amount of work (that is, the base 2 logarithm of the number of operations) to cryptanalyze a cryptographic algorithm or system.
Sources:
NIST SP 800-152

  A number associated with the amount of work (that is, the number of operations of some sort) that is required to break a cryptographic algorithm or system in some way. In this Recommendation, the security strength is specified in bits and is a specific value from the set {112, 128, 192, 256}. If the security strength associated with an algorithm or system is S bits, then it is expected that (roughly) 2S basic operations are required to break it.
Sources:
NIST SP 800-90A Rev. 1

  A number characterizing the amount of work that is expected to suffice to "break" the security definition of a given cryptographic algorithm.
Sources:
NIST SP 800-108r1 [August 2022 (Includes updates as of 02-02-2024)]

  A number characterizing the amount of work that is expected to suffice to “defeat” an implemented cryptographic mechanism (e.g., by compromising its functionality and/or circumventing the protection that its use was intended to facilitate). In this Recommendation, security strength is measured in bits. If the security strength of a particular implementation of a cryptographic mechanism is s bits, it is expected that the equivalent of (roughly) 2s basic operations of some sort will be sufficient to defeat it in some way.
Sources:
NIST SP 800-56C Rev. 2 under Security strength