Security Characteristics of Cryptographic Mobility Solutions
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1 Security Characteristics of Cryptographic Mobility Solutions Dr. Sarbari Gupta Electrosoft Services Tel: (703)
2 Agenda What is a Cryptographic Mobility (CM) Solution? Functional Architecture Phases of Operation Characteristics that impact security Potential Security Issues Usage and Applicability Product Sampler Concluding Remarks Electrosoft, st Annual PKI Workshop 2
3 What is a CM Solution? Roaming users need access to their cryptographic credentials from a variety of systems/workstations Available mechanisms for Roaming Access: Portable Tokens Software Tokens Hardware Tokens Credential Server Solutions (Cryptographic Mobility Solutions) Characteristics of CM Solutions: No hardware or software tokens required Vendor-specific Client Software may be required User Credentials (partial or whole) stored on Online Server User authentication to Online Server to obtain access to credentials Ability to use crypto credentials from any connected workstation Electrosoft, st Annual PKI Workshop 3
4 Functional Architecture user authentication Authentication Server(s) Secure interactions with PKI peers Client Station Client Software credential initialization Initialization Server Certification Authority credential download or usage Credential Server(s) Electrosoft, st Annual PKI Workshop 4
5 Credential Initialization Phases of Operation Generation and/or Packaging of credentials for roaming usage Authentication Roaming user authentication to Remote Servers Credential Download Part of whole credential downloaded to user local system Credential Usage Application of credential to secure online transactions Credential Release Removal of local copy of credential to prevent reuse Electrosoft, st Annual PKI Workshop 5
6 Characteristics that Impact Security Client Station is shared by multiple users Low assurance of hardware and OS software More vulnerable to hacking if remnants of cryptographic session remain Client software downloaded to Client Station Vulnerable to spoofing Difficult to establish trust Authentication Server available online Exposed to online attacks on Authentication Database Vulnerable to Denial-of-Service attacks Credential Server available online Vulnerable to online attacks - high value system holding a large number of credentials Vulnerable to Denial-of-Service attacks Protocol interactions over untrusted networks Online protocols may be exposed to attacks Electrosoft, st Annual PKI Workshop 6
7 Potential Security Concerns (I) Key Initialization Issues Key pair generation location Mechanism of credential transport to Server Key Storage Issues Accessibility of private keys to Server Cryptographic protection of credentials stored on Server Impact of compromise of Credential Server Authentication Issues Authentication spoofing Eavesdropping Denial-of-service Credential Download Issues Capture of credential during download Electrosoft, st Annual PKI Workshop 7
8 Credential Usage Issues Potential Security Concerns (II) Credential usage location client station or server? Credential Release Issues Disabling credential reuse Client Station Trust Issues Establishing trust in Client Software Client misuse of User authentication data Client misuse of User Credential information Electrosoft, st Annual PKI Workshop 8
9 Usage and Applicability Requirements that drive CM Usage Highly mobile users Use of multiple workstations not under organizational control Software tokens not practical or secure enough Simple user interface needed account names and passwords Strong (PKI) authentication needed by application Contraindications for CM Usage Strong non-repudiation is a must Recovery of encryption keys is essential Zero tolerance for denial-of-service Electrosoft, st Annual PKI Workshop 9
10 Product Sampler Entrust Roaming PKI VeriSign Roaming Arcot ID Mobility SingleSignOn.Net Appliance Microsoft Roaming Profiles RSA Security Keon Web Passport Baltimore UniCert Option for Roaming Hush Communications HushMail (See paper for brief descriptions) Electrosoft, st Annual PKI Workshop 10
11 Concluding Remarks No major weaknesses found in the cryptography or the protocols used Common Security Concerns Remain: Basis of trust on Client Station shaky at best Susceptibility to Denial-of-Service attacks Authentication Servers susceptible to attack/compromise Credential Servers represent high value targets Non-repudiation is weaker if Servers have direct/indirect access to private keys However, CM Solutions represent: Much needed functionality A category of PKI implementations that are easy to use and deploy Improved security compared to software token solutions Sufficient security for most online secure transactions Electrosoft, st Annual PKI Workshop 11
12 Thank You! Questions?? Electrosoft, st Annual PKI Workshop 12
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