Integrity (cryptography)

Integrity of the data

In a general way, the integrity of the data indicates the state of Donnée S which, during their treatment, of their conservation or their transmission, do not undergo any deterioration or voluntary destruction or accidental, and preserve a format allowing their use. The integrity of the data includes/understands four elements: integrality, precision, exactitude/authenticity and validity.

In fact, the expression integrity of the data corresponds to two slightly different concepts, according to whether the context is that of the Télécommunications or the Cryptographie.

If the general principle is the same one - the Donnée S should not be modified since their creation, to include/understand in the broad sense (writing on a memory support, transmission…) - the Cryptographie wants to be able to affirm that the Donnée S have or were not modified, which is often done via a Fonction of chopping or, better, MAC ( Message authentication codes ) which adds the use of a secret key, while in telecommunication, one simply wishes to be able to detect and often correct these modifications.

Another way of presenting this difference is to say that the Cryptographie seeks to prove that there no was falsification, whereas telecommunications seek to check that there no were errors of “copy”.

Let us specify that in a relational Database, the integrity of the data has three aspects:

Precision;
Exactitude;
Validity.

There exist several models of integrity, among which one can quote the Modèle Biba, and the Modèle of Clark and Wilson.

Integrity of a system

The integrity of a system is a principle according to which a computing system is protected from the dysfunctions, the aggressions and the attacks. Insinuation that the treatment carried out by the system must be complete, exact, fast and authorized.

Internal bonds

CBC-MAC
HMAC

External bonds

has comparison off Dated Integrity Models
Integrity mandatory policy

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