Security Protocol

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A security protocol (cryptographic protocol or encryption protocol) is an abstract or concrete protocol (computing) that performs a information security-related function and applies cryptographic methods.

A protocol describes how the algorithms should be used. A sufficiently detailed protocol includes details about data structures and representations, at which point it can be used to implement multiple, interoperable versions of a program.

Cryptographic protocols are widely used for secure application-level data transport. A cryptographic protocol usually incorporates at least some of these aspects:

Key agreement or establishment
Entity authentication
Symmetric encryption and message authentication key (cryptography) material construction
Secured application-level data transport
Non-repudiation methods

For example, Transport Layer Security (TLS) is a cryptographic protocol that is used to secure web (HTTP) connections. It has an entity authentication mechanism, based on the X.509 system; a key setup phase, where a symmetric encryption key is formed by employing public-key cryptography; and an application-level data transport function. These three aspects have important interconnections. Standard TLS does not have non-repudiation support.

There are other types of cryptographic protocols as well, and even the term itself has various different readings; Cryptographic application protocols often use one or more underlying key agreements, which are also sometimes themselves referred to as "cryptographic protocols". For instance, TLS employs what is known as the Diffie-Hellman key exchange, which although it is only a part of TLS per se, Diffie-Hellman may be seen as a complete cryptographic protocol in itself for other applications.

Cryptographic protocols can sometimes be Formal verification on an abstract level.

Advanced cryptographic protocols A wide variety of cryptographic protocols go beyond the traditional goals of data confidentiality, integrity, and authentication to also secure a variety of other desired characteristics of computer-mediated collaboration. Blind signature can be used for ecash and digital credential to prove that a person holds an attribute or right without revealing that person's identity or the identities of parties that person transacted with. Time stamp can be used to prove that data (even if confidential) existed at a certain time. Secure multiparty computation can be used to compute answers (such as determining the highest bid in an auction) based on confidential data (such as private bids), so that when the protocol is complete the participants know only their own input and the answer. Undeniable signature include interactive protocols that allow the signer to prove a forgery and limit who can verify the signature. Deniable encryption augments standard encryption by making it impossible for an attacker to mathematically prove the existence of a plaintext message. Anonymous remailer create hard-to-trace communications.

See also

Secure channel

External links

Secure protocols open repository

Protocol home
Webpage of Protocol - the security intelligence company ... Protocol has ceased as a company and ended its operations in December 2007

Protocol home
Webpage of Protocol - the security intelligence company

Transport Layer Security protocol from FOLDOC
Transport Layer Security protocol < networking, protocol > (TLS) A protocol designed to allow client/server applications to communicate over the Internet without eavesdropping ...

Transport Layer Security protocol from FOLDOC
TLS ==> Transport Layer Security protocol < networking, protocol > (TLS) A protocol designed to allow client/server applications to communicate over the Internet without ...

Security and Privacy
Security and Privacy. Protocol National is committed to ensuring that your privacy as a user of this website is protected. If you apply to become a Visiting Lecturer you should ...

Protocol Solutions , Network Security, Penetration Testing, Languard ...
Protocol Solutions provides reliable and efficient vulnerability management services to companies wishing to secure their networks. We specialise in Computer Network Safety and ...

Security Protocol for Active Networks - UCL Eprints
Active packets carrying management and control code have a dynamic nature and support dynamic routing. Thus, active packets must be protected in an end-to-end and hop-to-hop ...

The application of software and safety engineering techniques to ...
The application of software and safety engineering techniques to security protocol development Nathalie Louise Foster Submitted for the degree of Doctor of Philosophy University of ...

Protocol switch security risk in Cisco IOS | The Register
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