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BN_SECURITY_BITS(3)                 OpenSSL                BN_SECURITY_BITS(3)


BN_security_bits - returns bits of security based on given numbers


#include <openssl/bn.h> int BN_security_bits(int L, int N);


BN_security_bits() returns the number of bits of security provided by a specific algorithm and a particular key size. The bits of security is defined in NIST SP800-57. Currently, BN_security_bits() support two types of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC (Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both parameters L and N are used to decide the bits of security, where L is the size of the public key and N is the size of the private key. For IFC, e.g., RSA, only L is used and it's commonly considered to be the key size (modulus).


Number of security bits.


ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits() function. The symmetric algorithms are not covered neither.


DH_security_bits(3), DSA_security_bits(3), RSA_security_bits(3)


The BN_security_bits() function was added in OpenSSL 1.1.0.


Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 1.1.1v 2023-08-01 BN_SECURITY_BITS(3)

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