Which of the following is NOT a symmetric encryption method listed in the syllabus?

The correct choice identifies RSA as a method that is not symmetric encryption. RSA, which stands for Rivest-Shamir-Adleman, is an asymmetric encryption algorithm commonly used to ensure secure data transmission. In asymmetric encryption, two keys are used: a public key for encryption and a private key for decryption. This contrasts with symmetric encryption methods, which use the same key for both encryption and decryption.

In contrast, AES (Advanced Encryption Standard), DES (Data Encryption Standard), and Blowfish are all examples of symmetric encryption methods. These methods utilize a single shared key to encrypt and decrypt information, making them suitable for scenarios where secure key distribution is manageable among parties.

Understanding the distinction between symmetric and asymmetric encryption is crucial for recognizing their applications and implications in data security.