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Cryptography

What is Cryptography?

The word cryptography in Greek means “secret writing.” However, the term today refers to the science and art of transforming messages to make them secure and immune to attacks. Figure shows the components involved …

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Symmetric-Key Cryptography

Symmetric-Key Cryptography In symmetric-key cryptography, the same key is used by both parties. The sender uses this key and an encryption algorithm to encrypt data; the receiver uses the same key and the corresponding decryption …

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Public-Key-Cryptography

Public-Key-Cryptography In public-key cryptography, there are two keys: a private key and a public key. The private key is kept by the receiver. The public key is announced to the public. …

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What is message security?

Message Security Let us first discuss the security measures applied to each single message. We can say that message security provides four services: privacy (confidentiality), message authentication, message integrity, and non-repudiation. Privacy Privacy means that the sender …

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What is Digital Signature?

What is Digital Signature? Digital Signature We said that security provides four services in relation to a single message: privacy, authentication, integrity, and non-repudiation. We have already discussed privacy. The other three can be …

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What is user Authentication?

What is user Authentication? User Authentication The main issue in security is key management. However, key management involves user authentication. We, therefore, briefly discuss these issues.   User Authentication with Symmetric-Key Cryptography In this section, …

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What is Cryptography?

What is Cryptography? Cryptography is the science and art of transforming messages to make them secure and immune to attack. Cryptography is used to encryption renders a message unintelligible to unauthorized personnel. Decryption transforms …

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