There are a few options for ciphers used in SFTP. If you enable logging at the Debug level, you can see which cipher was selected in the negotiation process.
Cipher strength is normally compared in terms of key size. Although key sizes can't really be compared between ciphers, they give a bit of an idea.
The ciphers supported in edtFTPnet/PRO for SFTP are listed below, together with their key sizes:
- TripleDES has an effective key size of 112 bits.
- Blowfish has a key size of 128 bits in SFTP
- AES-128 has a key size of 128 bits (AES-192 has 192 bits, and AES-256 has 256 bits).