Security Technology Lab The CSSM PKCS #11 Adaptation Layer Adapting the Technologies and Obtaining Module Integrity Using the CDSA Infrastructure Matthew Wood RSA PKCS Workshop October 8th 1998

Security Technology Lab Summary What Is CDSA? The PKCS #11 Service Provider for CDSA The CDSA Integrity Model Bilateral Authentication Signing PKCS #11 Service Providers More Information

Security Technology Lab What Is CDSA? Layered Security Services CSSM Security API Common Security Services Manager Security Service Add-in Modules Service Provider Interfaces Applications CDSA defines a four-layer architecture for cross-platform, high-level security services CSSM defines a common API & SPI for security services, & an integrity foundation Service Providers implement selectable security services

Security Technology Lab CDSA Vendors Apple’s Security Architecture (MacOS * ) –CSP with ECC using Fast Elliptic Encryption (FEE) algorithm, crypto based on discrete logs over GF(p) or GF(2 n ); Smartcards to follow Hewlett-Packard (HPUX*) –Software CSP for initial release IBM KeyWorks * (Windows* 95, Windows NT*, AIX*, others ) –Shipped Sept-97 –Bsafe, PKCS #11 and CCA CSPs Motorola CipherNet * Toolkit (Windows* 95, Windows NT*) –160 and 210 ECC CSP; Smartcards to follow RSA Certificate Security Suite * (CSS) (Windows* 95, Windows NT*) –support for CDSA-based products in 1998 –BSafe and ECC CSPs (odd and even field characteristics) * These marks are the property of their respective owners.

Security Technology Lab The PKCS #11 Service Provider for CDSA Built using the Intel Multi- service Addin Framework (MAF) CSSM SPI MAF PKCS #11 AL PKCS #11 Module The Adaptation Layer (AL) translates CSSM data types to the corresponding PKCS #11 types The AL performs session management as required by the requests made through the CSSM SPI

Security Technology Lab PKCS #11 Service Provider Features Single code base for all PKCS #11 implementations (MAF/AL) Supports PKCS #11 v1.0 and v2.x (AL) Supports standard key and parameter formats (PKCS #1, PKCS #3, etc.) (MAF/AL) Provides integrity services to insure that the CSSM service provider is using the real PKCS #11 module (MAF) –The application will not be able to use the service provider if the PKCS #11 module is changed

Security Technology Lab The CDSA Integrity Model Mutual suspicion Components must have signed credentials –Certificates and a signed manifest Components must be signed Components must authenticate themselves and others –Bilateral authentication protocol Applications may authenticate themselves with the CSSM –The application may obtain higher strength cryptography with the proper credentials

Security Technology Lab The Signed Manifest Manifest executable: app.exe Manifest Hash Signed Manifest Hash PKCS#7 Signature Block Cert1Cert2Cert3 Signature Block executable: module.dll Section Name: MD5-Digest of Object Capabilities Object Reference Section Name: MD5-Digest of Object Capabilities Object Reference A signed manifest contains verification information about any number of objects, signed by any number of certificates.

Security Technology Lab Bilateral Authentication Object #1 Object #2 Manifest #2 Manifest #1 Step 1: Object #1 performs a self-check

Security Technology Lab Bilateral Authentication Object #1 Object #2 Manifest #2 Manifest #1 Step 1: Object #1 performs a self-check Step 2: Object #1 verifies Object #2 Trust

Security Technology Lab Bilateral Authentication Object #1 Object #2 Manifest #2 Manifest #1 Step 1: Object #1 performs a self-check Step 2: Object #1 verifies Object #2 Step 3: Object #2 performs a self-check Trust

Security Technology Lab Bilateral Authentication Object #1 Object #2 Manifest #2 Manifest #1 Step 1: Object #1 performs a self-check Step 2: Object #1 verifies Object #2 Step 3: Object #2 performs a self-check Step 4: Object #2 verifies Object #1 Trust

Security Technology Lab Bilateral Authentication Object #1 Object #2 Manifest #2 Manifest #1 Step 1: Object #1 performs a self-check Step 2: Object #1 verifies Object #2 Step 3: Object #2 performs a self-check Step 4: Object #2 verifies Object #1 Result: Mutual trust between objects Mutual Trust

Security Technology Lab Signing PKCS #11 Service Providers The PKCS #11 Service Provider (SP) for CSSM is signed as the first object in the manifest. –Provides the ability for the CSSM to verify the SP before loading and permits a self-check to be performed after being loaded. The PKCS #11 Module is signed as an additional object in the manifest. –The CSSM and SP are able to verify the PKCS #11 Module as part of the SP loading process.

Security Technology Lab Trust Relationships Bilateral authentication for the PKCS #11 Service Provider and unilateral authentication for the PKCS #11 Module. CSSM PKCS #11 Service Provider PKCS #11 Module bilateral unilateral

Security Technology Lab Obtaining Higher Levels of Trust Merge the CSSM service provider and the PKCS #11 module into a single object. Provides a complete bilateral authentication throughout the CDSA stack. CSSM PKCS #11 Service Provider PKCS #11 Module bilateral

Security Technology Lab More Information CDSA specification adopted by The OpenGroup: – CDSA Product Day slides from vendors: – Intel CDSA web site –Includes CDSA 1.2 specs, CDSA presentations and future CDSA-related specs. – Intel Platform Security Division Marketing –Mike Premi Phone: (503)