Crypto

1 - About

Cryptography is the science of cryptographic algorithms (known as Cipher) that implements the following functionalities:

Cryptographic algorithms transforms:

In designing security systems, it is wise to assume that the details of the cryptographic algorithm are already available to the attacker. This is known as:

Because the algorithms are well known. it's the only the parameter of cipher algorithm that protect the anonymity. This parameter is known as the private key.

An attacker who obtains the key can :

2 - Characters

Alice and Bob are fictional characters commonly used as placeholder names in cryptology

3 - Principles

Kerckhoffs's_principle A cryptosystem should be secure even if everything about the system, except the private key, is public knowledge.


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