What are cryptographical techniques for ciphertext?

Cryptographical techniques for ciphertext include symmetric encryption, where the same key is used for both encryption and decryption, and asymmetric encryption, which employs a pair of keys (public and private) for secure communication. Common algorithms for symmetric encryption include AES (Advanced Encryption Standard) and DES (Data Encryption Standard), while RSA (Rivest-Shamir-Adleman) is a widely used asymmetric algorithm. Additionally, techniques like hashing (e.g., SHA-256) ensure data integrity by converting plaintext into a fixed-size hash value, while digital signatures authenticate the origin of a message. These techniques collectively enhance data security and confidentiality in various applications.