59597
Crypto U12, SSL
- background
- sits on top of TCP
- roughly equivalent to TLS
- roughly equivalent to TLS
- created by IETF
- Internet Engineering Task Force
- Internet Engineering Task Force
- sits on top of TCP
- design
- designed for open
environments where entities do
not have a security association
- security association: having some
relationship where communicating entities
have agreed or exchanged security
related info or cryptographic keys
- security association: having some
relationship where communicating entities
have agreed or exchanged security
related info or cryptographic keys
- security requirements
- confidentiality
- data origin authentication
- entity authentication
- confidentiality
- can provide 2 types of authentication
- client only
- mutual entitiy
- client only
- minimalizes public key operations
- decryption of public key message is placed at
the server and saves work for the client
- designed for open
environments where entities do
not have a security association
- crypotgraphic
primitives: uses hybrid
encryption
- public key cryptography
- enables symmetric
key establishment
- enables symmetric
key establishment
- digital signatures
- sign certificates and facilitate
entity authentication
- sign certificates and facilitate
entity authentication
- MACs
- used to provide data origin
authentication and entity authentication
- used to provide data origin
authentication and entity authentication
- hash functions
- part of MACs, digital signatures, key derivation
- part of MACs, digital signatures, key derivation
- public key cryptography
- algorithms used
- Flexible standard. Supports
many different algorithms
and key lengths.
- during exchange,
entities agree upon
a "cipher suite"
- cipher suite - collection of algorithms that
communicating entities agree upon
- cipher suite - collection of algorithms that
communicating entities agree upon
- during exchange,
entities agree upon
a "cipher suite"
- common
- AES in CBC mode
- HMAC using SHA-256
- digital signature algorithms
- RSA
- DSA
- RSA
- AES in CBC mode
- Flexible standard. Supports
many different algorithms
and key lengths.
- protocols used
- handshake
- extablish agreements
appropriate to secure
communication
- agree upon cipher suite
- extablish entitity authentication
- establish keys for secure channel
- agree upon cipher suite
- sometimes mutual entity
authentication is needed in
closed systems. basic handshake
protocol does not provide this.
- so, a "modified handshake
protocol" can be used
- so, a "modified handshake
protocol" can be used
- extablish agreements
appropriate to secure
communication
- record
- implements secure channel
- implements secure channel
- handshake
- security issues
- will not work if process failures
- ex: client does not
perform PKCS checks
- ex: client does not
perform PKCS checks
- implementation failures
- relies on many
cryptographic primitives
- relies on many
cryptographic primitives
- key mgt failures
- usage failures
- security features overestimated
and gain a false sense of security
- security features overestimated
and gain a false sense of security
- will not work if process failures
- key management
- generation
- asymmetric keys
- through PKMS
- through PKMS
- symmetric keys
- derived from master secret
- lightweight
- allows many keys to be generated
- reliant on client's ability to generate a random pre-master secret
- derived from master secret
- asymmetric keys
- establishment
- pre-master key shared through
public key encryption
- pre-master key shared through
public key encryption
- storage
- private keys must be
stored in safe place
- very sensitive, but short-lived
- private keys must be
stored in safe place
- usage
- key separation enforced
- separate keys for communication between
client & server and server & client
- prevents reflection attacks
- prevents reflection attacks
- key separation enforced
- generation
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