Part III-b. Universität Klagenfurt - IWAS Multimedia Kommunikation (VK) M. Euchner; Mai Siemens AG 2001, ICN M NT

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1 Part III-b

2 Contents Part III-b Secure Applications and Security Protocols Practical Security Measures Internet Security IPSEC, IKE SSL/TLS Virtual Private Networks Firewall Kerberos SET

3 Security Measures (1) Smart-Cards Siemens Corporate Smartcard, SICRYPT Biometry FingerTip Mouse Crypto Chips Secured PC SCENIC PC

4 Security Measures (2) Security Protocols TLS Netscape Crypto Algorithms and Toolkits DES/AES, Crypto Library ACRYL Secured Applications Trusted MIME Secure Operating Systems Windows2000, SINIX

5 Security Measures (3) Crypto Boxes TopSec, optiset Privacy Module Firewalls Anti Virus Software Security Audit, Security Threat Analysis Security Infrastructure Trusted CA

6 Internet Security Protocol Layers Electronic Commerce Layer SET, Ecash, S-HTTP PGP PEM S/MIME Transport Layer Security (SSH, SSL, TLS) Datagram Security Protocol (WTLS, DSP) PKIX Transmission Control Protocol (TCP) User Datagram Protocol (UDP) IP/ IP/ IPSec (Internet Protocol Security) Public-Key Infrastructure The security services provided by security mechanisms or protocols depend on the layer of integration: the mechanisms can only protect the payload and/or header information available at this layer header information of lower layers is not protected

7 Placement of Security Functions Higher Layers K K K K Middle Layers K Lower Layers K K K K application specific, technology independent, end-to-end security possible usually software implementations higher layer security does not protect lower layers attractive when balancing security concepts from higher and lower layers link/point-to-point security suited for crypto hardware lower layer can provide security services for and protect higher layers security functions inside the operating systems

8 Internet Protocol Security (IPSEC) IP Authentication Header (AH) for IP packet integrity and partial replay protection Encapsulating Security Payload (ESP) for IP packet confidentiality and integrity Application // IKE Application Data SA SA Establishment Authentication Key Key Establishment AH, ESP can operate in a Transport and in a Tunnel mode application for Transport mode is secure host-to-host transport application for Tunnel mode is secure Virtual private networking (VPN) with security gateways TCP/UDP IP/IPSec Encapsulation Decapsulation Handshake IKE is the default key-management protocol for IPSEC various key-exchange/keyestablishment protocols defined based on Diffie-Hellman Protected Data See IETF RFC

9 IPSEC Transport and Tunnel mode Original IP packet IP Header TCP Header Data encrypted Transport Mode protected packet IP Header ESP header TCP Header Data ESP trailer Authenticated encrypted Tunnel Mode protected packet IP Header ESP header IP Header TCP Header Data ESP trailer Authenticated

10 Internet Key Management (IKE) Peer A IKE phase 1: Create secure IKE channel Peer B IKE IKE phase 2: Create IPSEC SA IKE supply IPsec SA AH/ESP AH/ESP protected channel supply IPsec SA AH/ESP

11 IKE Phases IKE operates in two phases Phase 1 sets up a secure channel (referenced as ISAKMP SA). This requires a key exchange (Diffie-Hellman algorithm) with authentication (based on preshared symmetric keys, public key encryption or digital signatures). Phase 2 negotiates IPsec SAs over this secure channel. Derivation of several IPsec SAs or re-negotiation is possible without a new Phase 1 exchange.

12 Transport Layer Security (TLS) Secure Socket Layer (SSL) Application TLS Application Data Negotiation Encapsulation Authentication Decapsulation Key Establishment Browser https:// SSL Secure WWW Server SSL TCP IP IP Protected Data Handshake Transport System Transport System HTTP HTTP over SSL SSL/TLS provide optional client and server authentication with keymanagement and connection-oriented data confidentiality and integrity. There are only minor differences between SSL and TLS but they are not interoperable.

13 Client Compute session keys SSL/TLS Handshake protocol Handshake: ClientHello(supported ciphers, Random) Handshake: ServerHello(chosen cipher, Random) Handshake: Certificate Handshake: ServerHelloDone Handshake: ClientKeyExchange ChangeCipherSpec(encrypted Master Secret) Handshake: Finished (session MAC) ChangeCipherSpec(encrypted Master Secret) Handshake: Finished(session MAC) Server Compute session keys application_data application_data Alert: warning, close_notify

14 Some SSL/TLS applications secure WWW communication (HTML/XML over TLS) secure LDAP (LDAPS) secure mobile WAP communication with WTLS secured network management (SNMP over TLS) secure e-commerce transactions (protected credit-card number) secure login (server certificate + user password or with client certificate) other secured Internet Applications (IMAP/POP3, NNTP, FTP, over TLS,...) secured multimedia/voice-over-ip signaling (H.235)

15 SSL/TLS building blocks Application layer protocol SSL/TLS handshake layer protocol SSL/TLS change cipher spec protocol SSL/TLS alert protocol SSL/TLS record layer protocol TCP/IP layer protocol lower layer protocol

16 SSL/TLS record layer encapsulation Plaintext application layer PDU Content Type TLS/ SSL version length Application layer PDU MAC CBC padding CBC padding length encrypted protected SSL/TLS record layer PDU

17 SSL/TLS References IETF RFC 2246 The TLS Protocol Version 1.0, IETF RFC 2487 SMTP Service Extension for Secure SMTP over TLS, IETF RFC 2595 Using TLS with IMAP, POP3 and ACAP, IETF RFC 2817 Upgrading to TLS Within HTTP/1.1, 2000.

18 Virtual Private Networks (VPN) Intranet FW Client (Corporate Network) FW Secured VPN Internet FW Intranet (Corporate Network) Client Intranet (Corporate Network) Client

19 VPN are secure, private overlay networks over the Internet. secure tunneling protects any transmitted traffic between secure islands. IPSEC, L2TP, PPP and SSL are the most widely used VPN techniques. a VPN can be built on its own or be provided externally as a network service. Firewalls or cryptoboxes can provide VPNs.

20 Firewall Mail Authentication Logging NEWS Accounting Client Anti Virus Internet WWW DNS other Proxy NAT IPSEC Crypto box VPN Intranet (Corporate Network) Client

21 Firewall are security gateways that are placed at the perimeter of a security domain. control in/outgoing access to/from Intranet, Extranets and the Internet. help enforcing a security policy. Policies rules can be built using K packet filter K stateful inspection K application level gateway (ALG) typically provide auxiliary security functions such as remote authentication, VPN, Anti Virus filter, proxies, logging/accounting and network address translation (NAT). are a potential bottleneck.

22 Kerberos Architecture Kerberos Server 2. TGS ticket Ticket Granting Server 4. Server ticket 1. Request a TGS TGS ticket 3. Request a server ticket Client 5. Service Request Application Server

23 Kerberos was developed by MIT in 1970s for large campus computer networks. uses a central, trusted key management center for authentication and as a key distribution facility. is based entirely on symmetric keys (master keys, authentication keys, session keys) and synchronized time clocks. Tickets convey shielded session keys and granted permission. provides (authenticated) single-sign on and access control services to authorized resources. supports reliable accounting for used services. the core crypto protocols had several weaknesses, some caution is still necessary. there is also a public-key variant of Kerberos. there is a UNIX version in the public-domain.

24 Secure Electronic Transaction (SET) Scenario Bank issues a credit card for the customer Issuer (Customer s bank) Secure financial network Acquirer (Merchant s bank) Bank accepts and processes payment offer from Merchant owns a credit card purchases and pays digitally Customer relationship Cardholder (customer) Certification Authority (CA) Issues certificates Internet Monetary transfer Payment Gateway (PG) Processes payment offer Customer relationship Merchant (shop) sells goods via Internet accepts digital payments

25 SET Transaction 1. Customer queries shop 2. Merchant sends order form 3. Customer chooses payment method 4. Customer sends purchase order and payment authorization (SET) 5. Merchant confirms purchase order (SET) 6. Authorization Request, acquirer bank confirms customer s payment authorization (SET) 7. Merchant delivers goods Issuer (Customer s bank) a Acquirer (Merchant s bank) 6 Payment Gateway (PG) 8 SET 8. Merchant requests payment from acquirer bank (SET) 9. Acquirer bank performs clearing with customer s bank Cardholder (customer) Merchant (shop) 10. Customer s bank sends bill to customer. SET SET

26 SET Certificate Hierarchy Root Signature Brand Signature Geopolitical Signature SET Visa, MasterCard,... Deutschland, USA,... Deutsche Bank,... Issuer Signature Acquirer Signature Commerzbank,... Jochen Müller,... Cardholder Signature ASK,... Merchant Signature Payment GW Signature

27 SET Security Hash-Algorithms SHA-1 (160 bit has length) Encryption DES-56 in CBC mode, exportable DES-40 (CDMF) RSA (1024 bit key length, Root CA 2048 bit) X.509 certificates RSA for digital envelopes and digital signatures (PKCS#7) Dual signatures: Sign (MD (MD (payment auth.) MD (offer desc.))) idempotent messages, multiple send possible nonces allow detection of duplicates

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