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BN_security_bits(3) OpenSSL BN_security_bits(3) NAME BN_security_bits - returns bits of security based on given numbers LIBRARY libcrypto, -lcrypto SYNOPSIS #include <openssl/bn.h> int BN_security_bits(int L, int N); DESCRIPTION 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). RETURN VALUES Number of security bits. NOTES ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits() function. The symmetric algorithms are not covered neither. SEE ALSO DH_security_bits(3), DSA_security_bits(3), RSA_security_bits(3) HISTORY The BN_security_bits() function was added in OpenSSL 1.1.0. COPYRIGHT 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>. 1.1.1i 2019-06-09 BN_security_bits(3)