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  • 2. 01 - Yale University
    Capability List – Scheme required to locate capability in the system before capability can be revoked Reacquisition – periodic delete, with require and denial if revoked Back-pointers – set of pointers from each object to all capabilities of that object (Multics) Indirection
  • PowerPoint Presentation
    - a list of revoked certificates This list is checked during certificate verification by a certificate holder to verify the revocation status for a given certificate
  • Slide 1
    Is the identity-based public key revoked? 1 Registers identity-based public key 2 Issues corresponding private key Revocation Server Periodic updates of revoked identity-based public keys 4 Challenge ciphertext 5 Result of decryption with private key ID Authority User IdP 1 Service request 2 S_ID, attr names 8 Notarized blinded assertion 3
  • William Stallings, Cryptography and Network Security 5 e
    To support this, each CA must maintain a list consisting of all revoked but not expired certificates issued by that CA, known as the certificate revocation list (CRL)
  • Chapter 23
    If the owner account A now revokes the privilege granted to B, all the privileges that B propagated based on that privilege should automatically be revoked by the system
  • Chapter 11: Cipher Techniques
    If applicable to one application and application layer mechanisms available, use that PEM for electronic mail If more generic services needed, look to lower layers SSL for transport layer, end-to-end mechanism IPsec for network layer, either end-to-end or link mechanisms, for connectionless channels as well as connections If endpoint is host, SSL and IPsec sufficient; if endpoint is user, application layer mechanism such as PEM needed Key Points Key management critical to effective use of cryptosystems Different levels of keys (session vs interchange) Keys need infrastructure to identify holders, allow revoking Key escrowing complicates infrastructure Digital signatures provide integrity of origin and content Much easier with public key cryptosystems than with classical cryptosystems Always fatal errors: unexpected_message, bad_record_mac, decompression_failure, handshake_failure, illegal_parameter May be warnings or fatal errors: no_certificate, bad_certificate, unsupported_certificate, certificate_revoked, certificate
  • William Stallings, Cryptography and Network Security 3 e
    Chapter 17 – Web Security Use your mentality Wake up to reality —From the song, "I've Got You under My Skin“ by Cole Porter Web Security Web now widely used by business, government, individuals but Internet Web are vulnerable have a variety of threats integrity confidentiality denial of service authentication need added security mechanisms SSL (Secure Socket Layer) transport layer security service originally developed by Netscape version 3 designed with public input subsequently became Internet standard known as TLS (Transport Layer Security) uses TCP to provide a reliable end-to-end service SSL has two layers of protocols SSL Architecture SSL Architecture SSL session an association between client server created by the Handshake Protocol define a set of cryptographic parameters may be shared by multiple SSL connections SSL connection a transient, peer-to-peer, communications link associated with 1 SSL session SSL Record Protocol confidentiality using symmetric encryption with a shared secret key defined
  • William Stallings, Cryptography and Network Security 3 e
    A network service (TGS or server) should be able to verify that person using the ticket is the same as the person that the ticket was issued to Remedy : use an authenticator Server should also authenticate to user Otherwise can setup a “fake” server A “fake” tuition payment server and capture the student’s credit card Remedy : use a challenge-response protocol Kerberos Realms a Kerberos environment consists of: a Kerberos server a number of clients, all registered with server application servers, sharing keys with server this is termed a realm typically a single administrative domain if have multiple realms, their Kerberos servers must share keys and trust Kerberos Version 5 developed in mid 1990’s provides improvements over v4 addresses environmental shortcomings encryption algorithm, network protocol, byte order, ticket lifetime, authentication forwarding, inter-realm authentication and technical deficiencies double encryption, non-standard mode of use, session keys, password attacks specified as Internet
  • PowerPoint Presentation
    This protocol enables clients to verify whether the certificate it is validating has been revoked The client queries the service to determine if the certificate is on the revocation list





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