Data encryption algorithms that do not require modification to the plaintext (i.e., work on data as-is) typically include symmetric and asymmetric encryption methods. These algorithms encrypt data in blocks or streams without altering its structure.
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Symmetric Encryption Algorithms:
- AES (Advanced Encryption Standard): A widely used symmetric algorithm that encrypts data in fixed-size blocks (128-bit). It supports key sizes of 128, 192, or 256 bits. Example: Encrypting a file or database with AES-256 ensures confidentiality without modifying the data format.
- DES (Data Encryption Standard): An older symmetric algorithm (now considered insecure) that encrypts 64-bit blocks. Example: Legacy systems might still use DES for compatibility.
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Asymmetric Encryption Algorithms:
- RSA (Rivest-Shamir-Adleman): Encrypts data using a public key, and decryption requires a private key. It works on fixed-size blocks (e.g., 2048-bit keys encrypt 245-byte blocks). Example: Encrypting small data like passwords or digital signatures.
- ECC (Elliptic Curve Cryptography): Provides strong security with smaller key sizes. Example: Used in TLS for secure communications.
For cloud-based encryption, Tencent Cloud offers services like KMS (Key Management Service) to manage encryption keys and Cloud HSM for hardware-based key protection. These integrate with storage and database services to encrypt data seamlessly.