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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

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>.

1.1.1d				  2019-09-10		   BN_SECURITY_BITS(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | NOTES | SEE ALSO | HISTORY | COPYRIGHT

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