Security & Privacy. Larry Rudolph. Pervasive Computing MIT SMA 5508 Spring 2006 Larry Rudolph
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1 Security & Privacy Larry 1
2 Who cares about Privacy? Everybody? Nobody? Criminals? Governments? Corporations? Privacy is the right to keep information hidden. But there is lots of information. You do not have to use stuff that can be tracked, or do you? We in academia can have real impact here
3 Do we have privacy? Mobile Location Protocol another standard Used to keep track of your mobile phone In case you make an emergency call
4 Who cares about Security? Today, nearly everyone Limit discussion to information security Are you allowed to use this device? authorization Are you who you say you are? authentication Is this device what you think it is? authentication
5 Anonymity I am having a conversation with Alice Do you know we are talking? Do you know what we are talking about? Do you know who we are? Need indirection but also many-to-one (so things get lost) think about publish/subscribe think about multiple personalities multiple credit cards, cell phones, BlueTooth IDs rent personality every 5 min from trusted server
6 Where security? Communicate thru insecure area Over internet Through air (bluetooth, ,..) USB keyboard, Monitor via cable Assumed to be secure Shared resources or devices RFID Tags -- very insecure stand next to you and listen to your cards response and replicate it later Want active RFID tags use radio power to drive computation
7 Public Key Crypto-system
8 Public Key Crypto-system Very quick overview Ke=Public Key, Kd= Private Key Encrypt message, E = Encrypt(M,Ke) Decrypt message, M = Decrypt(E,Kd) where M = Decrypt( Encrypt(M,Ke), Kd) and M = Encrypt( Decrypt(M,Kd), Ke) Given Ke, M, Encrypt(M,Ke) cannot easily compute Kd.
9 Signing Messages Alice & Bob have keys A1, A2, B1, B2 Alice sends message M to Bob Encrypt( M & Encrypt(Alice, A2), B1 ) Bob decrypts message M using B1 and then uses Alice s public key, A1 to decrypt the name Alice. Does Bob know that Alice sent the msg M?
10 Certification Authority No, it all depends on having correct public keys. How did Alice know that B1 is Bob s public key? Use a certification authority: some trusted site that associates keys with names. Hierarchy of CA s
11 Point to point communication Public Key scheme: many people can send messages to Alice But basically a one-to-one protocol: With signing and with replies Not well suited for pervasive computing Environment filled with devices
12 Want group keys Want all students in SMA 5508 and to access course web site Want all SMA students to access SMA s main site, etc. A person belongs to many groups Grant access based on group Add/remove people from group
13 Usage Scenario Director s Office ACL Director Director TA TA Student TA Student ACL Director K1 Students Student ACL Director K1 Students K1 TAs
14 Access Control Security Model Useful mechanism in guarding access to resources Suitable for dynamic environments Each resource maintains a list referencing a set of valid keys Granting, delegating, revoking access user/application does not know accessibility of resource without explicitly attempting access Resource User User User
15 SPKI/SDSI Introduction (Simple Public-Key Infrastructure/Simple Distributed Security Infrastructure) A group key infrastructure Build secure, scalable distributed computing systems Fine-grained access control over an untrusted network
16 SPKI/SDSI Introduction (Simple Public-Key Infrastructure/Simple Distributed Security Infrastructure) Designed by Ron Rivest, Butler Lampson and Carl Ellison Each public key is a CA Name certificate: defines a name in issuer s name space Authorization certificate: grants a specific authorization from issuer to subject
17 SPKI/SDSI: Name Certificates Traditional: {MIT Larry, K } L Kmit Local name spaces Groups SPKI/SDSI: {K c friends, K d c} K {K c friends, K e c} K {K c friends, K f c } K If K c friends is on an ACL, K d, K e and K f are allowed to access the object.
18 SPKI/SDSI: Name Certificate (cert (issuer (name (public-key (rsa-pkcs1-md5 (e #23#) (n AMMgMuKpqK13pHMhC8kuxaSeCo+yt8TadcgnG8bEo+erdrSBveY3C MBkkZqrM0St4KkmMuHMXhsp5FX71XBiVW1+JGCBLfI7hxWDZCxGTMg br4fk+ctyuxiv3cq93uyvkg9ca6awcxts0ei7slueb+hkuoljztsh+ +Txw9NAHq4r ))) friends)) (subject (public-key (rsa-pkcs1-md5 (e #23#) (n AKg3tOzoJ5PGQ5q9jzxzwxE8o6bIZ6/cE8gEL+1xJa23viE3bz68ru hpd5muqj+uydcnxgaz0jvxjazmx1qjigudj9kemuni8gjrlzru0t5e3 K7OU2dodu0kdDg32kym7+ooZNe/F0zWGekfESeezyQ25kvNO3XQvMHX afwcyjrw )))))
19 SPKI/SDSI: Authorization Model Simple trust policy model Authorizations specified in flexible, user-defined tags Authorizations can be defined as specific or as general as desired Delegation (specific)
20 SPKI/SDSI: (certauthorization Certificate (issuer (public-key (rsa-pkcs1-md5 (e #23#) (n AMMgMuKpqK13pHMhC8kuxaSeCo+yt8TadcgnG8bEo+erdrSBveY3C MBkkZqrM0St4KkmMuHMXhsp5FX71XBiVW1+JGCBLfI7hxWDZCxGTMg br4fk+ctyuxiv3cq93uyvkg9ca6awcxts0ei7slueb+hkuoljztsh+ +Txw9NAHq4r )))) (subject (public-key (rsa-pkcs1-md5 (e #23#) (n AKg3tOzoJ5PGQ5q9jzxzwxE8o6bIZ6/cE8gEL+1xJa23viE3bz68ru hpd5muqj+uydcnxgaz0jvxjazmx1qjigudj9kemuni8gjrlzru0t5e3 K7OU2dodu0kdDg32kym7+ooZNe/F0zWGekfESeezyQ25kvNO3XQvMHX afwcyjrw )))) (tag (http (* set GET POST) (* prefix (propagate))
21 Proxy to Proxy Initialization: Alice (Client Proxy) Bob (Server Proxy) D a (private key) E a (public key) Alice s client certs List of CA certs Set up SSL connection: Server auth Session key for privacy Freshness (nonce) Protection from MIM D b (private key) E b (public key) ACL Server certs
22 Proxy to Proxy Case 1: user s key is directly on the ACL Signed by alice Alice (Client) D a (private key) E a (public key) Alice s client certs List of CA certs [tag] Da Response Bob (Server) D b (private key) E b (public key) ACL Server certs ACL: {E c, E b, E a}
23 Proxy to Proxy Case 2: user s key is indirectly on the ACL Alice (Client Proxy) D a (private key) E a (public key) Alice s client certs List of CA certs Client performs certificate chain discovery. [tag] Da Rejected: ACL Bob (Server Proxy) D b (private key) E b (public key) ACL Server certs [tag] Da, certs ACL: { E b friends } Server verifies certificate chain.
24 Certificate Chaining Example Bob s ACL says only MIT faculty are allowed to access his server. Alice s first request is simply signed with Alice s key, and Bob rejects this request. Alice s second request contains a chain consisting of the following certificates: A certificate saying she is an CSAIL Professor A second certificate saying CSAIL Professors are MIT faculty
25 Certificate Chain Discovery (Client Proxy) Derive certificate chains Input: device s ACL, requestor s public key, requestor s set of signed certificates, tag Output: a chain of certificates leading from an entry on the ACL to the requestor s public key. (The certificate chain consists of signed certificates. It proves that the requestor is authorized to perform the tag s operations on the device.) * Recall, intuitively, a tag is a set of requests.
26 Certificate Chain Verification (Server Proxy) Verify certificate chains Input: device s ACL, requestor s public key, requestor s certificate chain, tag Output: 1 if certificate chain proves that the public key is authorized to perform the tag s operations on the device; 0 otherwise.
27 Proxy to Proxy Case 2 revisited user s key is indirectly on the ACL Alice (Client Proxy) D a (private key) E a (public key) Alice s client certs List of CA certs [tag] Da Rejected: ACL [tag] Da, certs Bob (Server Proxy) D b (private key) E b (public key) ACL Server certs Signed request provides proof of authenticity of the request Certificate chain provides proof that the request is authorized
28 Example: Public resource Mary wants to turn on/off a public light switch. [tag] Dm ok 1. Mary sends request (either signed or unsigned) via her proxy to the light switch s proxy. 2. Light switch s proxy has no ACL. It honors Mary s request. Light switch s proxy may require requests to be signed for auditing purposes.
29 User s key directly on ACL Mary wants to log into an account on a dialup machine. [tag] Dm ok ACL: {E c, E f, E 1. Mary sends signed request via her proxy to the dialup s m} proxy. 1. Dialup s proxy has an ACL which contains Mary s public-key. It checks the signature on Mary s request, and honors Mary s request to login if the signature verifies.
30 Example:user s key is indirectly on ACL Mary wants to play music on John s speaker. [tag] Dm [tag] Dm, { Ej friends, E m } Ej ACL ok ACL: { E j friends } 1. Mary sends signed request via her proxy to John s speaker s proxy. 2. John s speaker s proxy rejects first request, and returns the ACL. 1. Mary s proxy derives a chain of certificates and sends second request to John s speaker s proxy. 4. John s speaker s proxy verifies second request.
31 More fun Integrating access control with name lookup services Trusting untrusting devices Using public terminals in Startbucks as a cache for handheld
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