SFTP, or Secure File Transfer Protocol, is already encrypted by default. However, there are ways to further configure the data encryption for even more security.
1. Configure Key Exchange Algorithm: Ensure that the key exchange algorithm is secure by choosing a strong algorithm for maximum security. There are a number of key exchange algorithms available, but some of the most secure include Diffie-Hellman key exchange (DH), Elliptic-Curve Diffie-Hellman key exchange (ECDH), and RSA.
1. Use strong encryption ciphers: Another way to improve data encryption is by configuring strong encryption ciphers. AES (Advanced Encryption Standard) is the most commonly used encipher algorithm.
1. Change Key Size: Remove weak keys by setting a minimum key size. Keys provide the basis for encryption, so strong keys are essential. A key size of 2048 bits or greater for RSA is recommended.
1. Enable Perfect Forward Secrecy: Perfect Forward Secrecy creates a new key session for every subsequent SFTP session. As a result, if someone intercepts the communication or obtains the particular cryptographic keys, the potential of information leakage is minimized.
1. Disable old versions of SSL and TLS protocols: In order to avoid known vulnerabilities, avoid SSLv2 and SSLv3 and use a protocol version of at least TLS 1.2.
By implementing these steps, SFTP data encryption will be more secure.
