The transformation of a message into a ciphertext using a key, with decryption recovering the message using an appropriate key. Confidentiality and message authentication are separate properties; an encryption scheme needs explicit security hypotheses.
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Encryption is the process of converting information or data into a code to prevent unauthorized access. This process involves using algorithms and keys to transform readable data (plaintext) into an unreadable format (ciphertext). Only those who possess the correct key can decrypt the data back into its original form. Encryption serves various purposes, including: 1. **Data Security**: Protecting sensitive information from unauthorized access, ensuring that only intended recipients can read it.
