Keylength - Compare all Methods

title

In most cryptographic functions, the key length is an important security parameter. Both academic and private organizations provide recommendations and mathematical formulas to approximate the minimum key size requirement for security. Despite the availability of these publications, choosing an appropriate key size to protect your system from attacks remains a headache as you need to read and understand all these papers. This web site implements mathematical formulas and summarizes reports from well-known organizations allowing you to quickly evaluate the minimum security requirements for your system. You can also easily compare all these techniques and find the appropriate key length for your desired level of protection. The lengths provided here are designed to resist mathematic attacks; they do not take algorithmic attacks, hardware flaws, etc. into account.

Lenstra and Verheul Equations (2000) Lenstra Updated Equations (2004) ECRYPT-CSA Recommendations (2018) NIST Recommendations (2016) ANSSI Recommendations (2014) IAD-NSA CNSA Suite (2016) Network Working Group RFC3766 (2004) BSI Recommendations (2018)

			You can enter the year until when your system should be protected and see the corresponding key sizes or you can enter a key/hash/group size and see until when you would be protected. bits

	All key sizes are provided in bits. These are the minimal sizes for security.

© 2019		BlueKrypt - v 31.0 - June 10, 2018
	Author: Damien Giry Approved by Prof. Jean-Jacques Quisquater Contact:

Bibliography		[1]	Selecting Cryptographic Key Sizes, Arjen K. Lenstra and Eric R. Verheul, Journal Of Cryptology, vol. 14, p. 255-293, 2001.
	[2]	Key Lengths, Arjen K. Lenstra, The Handbook of Information Security, 06/2004.
	[3]	Algorithms, Key Size and Protocols Report (2018), H2020-ICT-2014 – Project 645421, D5.4, ECRYPT-CSA, 02/2018.
	[4]	Recommendation for Key Management, Special Publication 800-57 Part 1 Rev. 4, NIST, 01/2016.
	[5]	Mécanismes cryptographiques - Règles et recommandations, Rev. 2.03, ANSSI , 02/2014.
	[6]	Commercial National Security Algorithm, Information Assurance Directorate at the NSA, 01/2016.
	[7]	Determining Strengths for Public Keys Used for Exchanging Symmetric Keys, RFC 3766, H. Orman and P. Hoffman, 04/2004.
	[8]	Kryptographische Verfahren: Empfehlungen und Schlüssellängen, TR-02102-1 v2018-02, BSI, 05/2018.

politik