C ryptography is the practice and study of techniques for secure communication by transforming plaintext (readable data) into ciphertext (unreadable data) to protect it from unauthorized access. Key aspects of cryptography : 1. *Encryption*: Converting plaintext into ciphertext. 2. *Decryption*: Converting ciphertext back into plaintext. 3. *Secure communication*: Protecting data from interception, eavesdropping, and tampering. * Purpose of cryptography :* 1. *Confidentiality*: Protecting sensitive information from unauthorized access. 2. *Integrity*: Ensuring data is not tampered with or altered. 3. *Authenticity*: Verifying the identity of the sender and the integrity of the message. *Cryptography is used in various fields, including:* 1. *Secure online transactions* 2. *Data protection* 3. *Secure communication* 4. *Digital signatures* By using cryptography, individuals and organizations can protect their sensitive information and ensure secure communication in the digital age.
Decoding the World of Cryptography