Cryptography

Cryptography is the practice of securing communication through the use of techniques for confidentiality, integrity, authenticity, and non-repudiation. It involves the use of mathematical algorithms to convert plaintext into ciphertext, which is unreadable without the proper decryption key.
There are two main branches of cryptography: symmetric and asymmetric.

symmetric cryptography

In symmetric cryptography, also known as secret-key cryptography, the same key is used for both encryption and decryption. Examples of symmetric encryption algorithms include AES and DES.

asymmetric cryptography

On the other hand, in asymmetric cryptography, also known as public-key cryptography, two different keys are used for encryption and decryption. One key, known as the public key, is used to encrypt the data, while the other key, known as the private key, is used to decrypt the data. Examples of asymmetric encryption algorithms include RSA and Elliptic Curve Cryptography (ECC).

uses of cryptography

1. Cryptography is used to secure online communication by encrypting data, making it unreadable to unauthorized parties.
2. In SSL/TLS, encryption keys are used to secure website traffic and protect against eavesdropping.
3. Email providers use encryption to protect messages from being intercepted during transmission.
4. Cryptography is used to secure storage of sensitive information, such as encrypting hard drives.
5. Cryptographic authentication and digital signature protocols are used to confirm identity and protect against fraud.
6. Blockchain technology utilizes cryptography to secure transactions and protect against tampering.
7. Cryptography plays a crucial role in maintaining the confidentiality and integrity of data in various fields.
8. Cryptographic algorithms provide secure communication for IoT devices and prevent unauthorized access.
9. Cryptography is used in payment systems for secure transactions and protect against fraud.
10. Cryptography is essential for secure communication in various industries, including finance, healthcare, and government.

why use cryptography

Cryptography is used to protect sensitive information from unauthorized access, tampering, and disclosure. It provides confidentiality, integrity, and authenticity for the information being transmitted or stored.

Confidentiality: Cryptography is used to encrypt data, making it unreadable to anyone without the proper decryption key. This ensures that only authorized parties can access and read the sensitive information.

Integrity: Cryptography is used to protect data from unauthorized modification. Digital signatures and message authentication codes can be used to ensure that the data has not been tampered with during transmission or storage.

Authenticity: Cryptography is used to confirm the identity of the sender and prevent impersonation. Public key infrastructure (PKI) and digital certificates can be used to verify the identity of the sender and ensure that the information is coming from a trusted source.

who cryptography work it

The working of cryptography can be broken down into three main steps: encryption, transmission, and decryption.
Encryption: The process of converting plaintext into an unreadable form known as ciphertext. This is done using a set of mathematical algorithms, known as encryption algorithms, which take the plaintext and an encryption key as inputs and produce the ciphertext as output.

Transmission: The ciphertext is then transmitted over an insecure channel such as the internet. During transmission, the ciphertext is vulnerable to eavesdropping, tampering and man-in-the-middle attacks, so it must be protected using secure protocols.

Decryption: The process of converting the ciphertext back into its original plaintext form. This is done using a set of mathematical algorithms, known as decryption algorithms, which take the ciphertext and a decryption key as inputs and produce the plaintext as output. The decryption key is the same or mathematically related to the encryption key and should be kept secret and securely exchanged between the sender and the receiver.