National Security Agency Perspective on Key Management
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1 National Security Agency Perspective on Key Management IEEE Key Management Summit 5 May 2010 Petrina Gillman Information Assurance (IA) Infrastructure Development & Operations Technical Director National Security Agency (301) plgillm@nsa.gov
2 Agenda NSA Information Assurance (IA) Mission Secure Information Sharing Needs NSA Initiatives 2
3 NSA IA Mission Focused on Protecting US National Security Information and Information Systems National Security Systems are defined in Title 44 U.S. Code Section 3542, Federal Information Security Management Act of Includes systems that: Involve intelligence activities Cryptologic activities related to national security Equipment that is an integral part of a weapon or weapons system Critical to the direct fulfillment of military or intellitgence mission Classified information 3
4 Secure Information Sharing Secure Information Sharing requirements motivates the need for widespread cryptographic interoperability. Operational cryptographic interoperability needs include: Enable the US Government to securely share intelligence information with state and local First Responders Enable War fighters to securely share information on the battlefield with nontraditional coalition partners. 4
5 NSA Initiatives Commercial Solutions Partnership Program Cryptographic Interoperability Strategy (CIS) 5
6 Commercial Solutions Partnership Program Enable the use of a combination of COTS Information Assurance products composed to form a solution to protect information up to the Secret level Products used in CSPP solutions must be successfully evaluated under National Information Assurance Partnership Program and the NIST Cryptographic Module Validation Program National Information Assurance Partnership (NIAP) process will utilize new Standard Protection Profiles. More info at: NIST Cryptographic Module Validation Program for FIPS requirements Cryptographic Interoperability Strategy (CIS) / Suite B 6
7 CIS/Suite B Cryptographic Algorithms Algorithm Bit Size Function Standard ECDSA 256 / 384 Signature FIPS AES 128 / 256 Symmetric Encryption FIPS 197 ECDH 256 / 384 Key Exchange SP A SHA 256 / 384 Hashing FIPS Lower key sizes are acceptable for protecting up to SECRET information. Protecting Top Secret information requires the use of 256 bit AES keys, 384-bit prime modulus elliptic curve and SHA 384 as well as other controls on manufacture, handling and keying. 7
8 Suite B Cryptography for Internet Protocols IPsec: IETF RFC 4869 Suite B Cryptography for IPsec TLS: IETF RFC 5430 Suite B Cipher Suites for TLS; TLS Elliptic Curver Cipher Suites with SHA-256/384 and AES Galois Counter Mode (GCM) S/MIME: Suite B in Secure/Multipurpose Internet Mail Extensions (S/MIME) SSH: IETF RFC 5647 AES Galois Counter Mode for the Secure Shell Transport Layer Protocol 8
9 Suite B Implementation Guides Suite B Implementer s Guide to FIPS Specifies the Elliptic Curve Digital Signature Algorithm from FIPS 186-3, Digital Signature Standard, to be used in future and existing cryptographic protocols for Suite B products Includes the Suite B elliptic curve domain parameters Provides example data for the ECDSA signature algorithm and auxiliary functions necessary for ECDSA implementations to comply with FIPS and Suite B 9
10 Suite B Implementation Guides (cont.) Suite B Implementer s Guide to NIST SP A Details the specific Elliptic Curve Diffie Hellman (ECDH) keyagreement schemes from NIST SP A: Recommendation for Pair-Wise Key Establishment Schemes using Discrete Logarithm Cryptography to be used in future and existing cryptographic protocols for Suite B products Includes the Suite B elliptic curves and domain parameters, key generation methods & key derivation functions Companion Document: Mathematical Routines for NIST Prime Elliptic Curves. 10
11 Public Key Certificates & Certificate Processing Base Suite B Certificate and CRL profile -IETF RFC 5759 Suite B Certificate and Certificate Revocation List Profile -Profile of IETF RFC 5280 Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List Profile Implementations need to meet both Certificate and CRL formats and certificate and CRL processing requirements Some US national security communities have additional requirements that build upon the base profile. NSA can provide this additional guidance upon request. 11
12 Trust Anchors & Trust Anchor Management Trust Anchors Draft-ietf-pkix-ta-format-04 Trust Anchor Management Draft-ietf-pkix-tamp-07 Both standards are in the IETF RFC editors queue. Should be assigned RFC numbers shortly. 12
13 Certificate Management Supports requesting certificate signing services & receiving response Suite B Profile of Certificate Management over Cryptographic Message Syntax (CMS) Draft-turner-SuiteB-CMC-00.txt Profile and refinement of: RFC 5272 Certificate Management Over CMS, June 2008 RFC 5273 Certificate Management Over CMS (CMC): Transport Protocols, June 2008 RFC 5274 Certificate Management Messages over CMS (CMC): Compliance Requirements, June
14 Suite B Key Delivery Protocol Protocol to provision devices with cryptographic keys and other security objects from a provisioning infrastructure Cryptographic keys and other security objects are cryptographically protected all the way from the provisioning infrastructure into the devices Devices can retrieve cryptographic keys and other security objects directly from the infrastructure or via an intermediary Keys are encrypted, by the infrastructure, for specific devices Device unwraps key package within security boundary
15 Suite B Key Delivery Protocol Algorithms Security Service Message Digest Signature Content Encryption Key Encryption Key Agreement Message Authentication Code Key Packaging Algorithm Suite Algorithm(s) SHA-384 ECDSA-384 AES key Wrap (256) with Message Length Indicator AES key Wrap (256) with Message Length Indicator Ephemeral-Static ECDH-384 HMAC-SHA-384
16 Suite B Key Delivery Protocol Design Protocol utilizes and profiles commercial standards including: RFC 5652 Cryptographic Message Syntax\ Sign, encrypt and authenticate message content Draft-ietf-pkix-ta-format-04 & Draft-ietf-pkix-tamp-07 RFC 5430 Suite B Profile for Transport Layer Security HTTP protocols (RFC 2616, 2617, 2618) Soliciting Industry comments Please contact me for a copy of the specification
17 Contact Information Petrina Gillman (301) Commercial Solutions Partnership Program NSA Commercial Solutions Center (240) Attn: Industry Support Team 9800 Savage Road Suite 6944 Ft. Meade MD
18 Questions 18
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