What type of encryption methods are commonly used in e-filing systems?

The correct answer highlights the use of SSL/TLS encryption and AES encryption, which are widely recognized as secure methods used in electronic filing systems. SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) protocols are essential for ensuring secure data transmission over the internet. They establish a secure channel between a client and a server, protecting sensitive information from interception during transmission.

AES (Advanced Encryption Standard) is a symmetric encryption algorithm widely used for securely storing files. It provides robust data protection through its ability to encrypt and decrypt data using the same key, making it effective for safeguarding sensitive information both at rest and in transit.

The other options present less common or outdated encryption methods. For instance, RSA encryption and DES encryption, while historically relevant, do not provide the same level of security or efficiency in modern applications. Similarly, MD5 hashing is considered vulnerable and not suitable for secure data transmission, and while Blowfish can be a viable method for encryption, it is overshadowed by the more robust AES standard in contemporary use. Lastly, while both symmetric and asymmetric encryption play significant roles in cryptography, the specific combinations presented in the question context point toward the superior choice of SSL/TLS and AES for e-filing systems.