An organization wants to conduct secure transactions of large data files. Before encrypting and exchanging the data files, the organization wants to ensure a secure exchange of keys. Which of the…

DES (Data Encryption Standard) is a symmetric-key block cipher used for encrypting and decrypting data, not for key exchange.

Blowfish is a symmetric-key block cipher designed for encrypting and decrypting data, not for key exchange.

DSA (Digital Signature Algorithm) is used for generating and verifying digital signatures to ensure data authenticity and integrity, not for establishing a shared secret key.

Diffie-Hellman is a cryptographic protocol specifically designed for two parties to establish a shared secret key over an insecure communication channel. This shared secret can then be used to encrypt the actual data files with a symmetric encryption algorithm, ensuring a secure transaction.

3DES (Triple DES) is a symmetric-key block cipher that applies DES three times to each data block, used for encrypting data, not for key exchange.