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Cryptography Write for Us – We don’t realize that we use encryption daily to protect our digital lives. Whether you unlock your smartphone, shop online, or browse the web, encryption is the underlying technology that protects your data, identity, and digital footprint. Encryption is integral to the security processes used to save information in computer systems.

The security principles that a cryptosystem must ensure are data confidentiality, data authenticity, data integrity, and user authentication. Encryption is often characterized as the most vital part of the security process. In theory, cryptography offers strong security guarantees based on proofs and mathematical security models. However, real-world cryptographic implementations tend to be fragile and vulnerable when performed by non-experts. Therefore, knowledge of essential components and principles and secure implementations as specified in standards and specifications is necessary. This post provides an overview of modern cryptography, its building blocks and regulations, and outlines areas where developers can develop extensive knowledge to implement secure cryptographic protocols.

Modern Cryptography

Cryptography is the main application of cryptography. It consists of generating an incomprehensible drop of data from the actual data to guarantee confidentiality. As a process, it can be described as a set of encryption/decryption algorithms in which at least the two parties try to exchange information over an insecure network. An encryption algorithm is called a cypher, an unencrypted message is called plaintext, and the encrypted dirt that results from applying encryption to plaintext is ciphertext.

The encryption process uses a cypher and a private key to derive ciphertext. Without knowing the key, no one, not even an attacker, can decrypt the ciphertext and recover the original plaintext. The secret of encryption is that he must not discover a single bit of information about the plaintext of the ciphertext without knowing the key, so it goes further. The Kerkoff principle states that the security of any cryptographic algorithm lies in the secret of the cryptographic key. Therefore, the entire cryptographic algorithm can be made public, and security guarantees are maintain as long as the encryption key remains confidential.

In that context, two paradigms of cryptography are use to deal with the secure implementation, use, and protection of cryptographic keys: private-key cryptography and public-key cryptography.

Secret Key Cryptography

Symmetric Encryption

Symmetric encryption, also known as top-secret key encryption, uses the same cryptographic key to encrypt and decrypt data. The diagram below shows how plaintext is transform into ciphertext using encryption and a private key. The same key is use when the cypher is use in decryption mode to recover the plaintext of the ciphertext. A cypher consists of two algorithms, an encryption algorithm E(K,m) -> c that takes as parameters an encryption key K and a message m to encrypt and returns a ciphertext c, and a decryption algorithm D(K,m). It’s a set. c) -> m is the inverse operation of encryption, decrypting the message back to the original plaintext.

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