A hash function is a mathematical algorithm that takes an input of any length and produces an output of a fixed length. The output is often referred to as a hash, message digest, digital fingerprint, or checksum. It is used to verify the integrity of data and to secure communication.
For example, SHA-256 is a popular cryptographic hash function used for digital signatures and message authentication. It takes an input of any length and produces an output of 256 bits.
Symmetric cryptography, also known as secret key cryptography, is a type of cryptography where a single key is used to encrypt and decrypt data. This key is shared between two parties, and must be kept secret in order to maintain the security of the data. An example of symmetric cryptography is the Advanced Encryption Standard (AES).
Asymmetric cryptography, also known as public key cryptography, is a type of cryptography where two different keys are used to encrypt and decrypt data. One key is used to encrypt the data, and the other is used to decrypt the data. An example of asymmetric cryptography is the RSA algorithm.
1. Symmetric cryptography: Also known as secret-key cryptography, symmetric cryptography uses the same key for both encryption and decryption. A popular example of symmetric cryptography is the Advanced Encryption Standard (AES).
2. Asymmetric cryptography: Also known as public-key cryptography, asymmetric cryptography uses two different keys, one for encryption and one for decryption. A popular example of asymmetric cryptography is the RSA algorithm.
Cryptography is the practice of using complex mathematical algorithms to encrypt and decrypt data. It is used to protect sensitive information from unauthorized access and to ensure its integrity. For example, when you make a purchase online, the information you provide is encrypted using secure socket layer (SSL) technology, which helps to protect your personal information during the transaction.
Vaibhav Kothia