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Nov
17
2025
fileX

Upcoming Change to FINRA fileX SFTP SSH Ciphers and Algorithms

As a part of FINRA’s security enhancements, we are changing SFTP server's SSH Ciphers and Algorithms. 

What this means for you:

All users who transfer files via the fileX SFTP must update their configurations to use the newly supported SSH Ciphers and Algorithms. Failure to do so will result in an inability to access the fileX application via SFTP.

What's not affected:

There is no impact for non-SFTP fileX integrations.

Next Steps:

Please review the list of newly supported Ciphers and Algorithms provided below and ensure your systems are updated accordingly.  Timeline for the change is also included below.

New Supported Ciphers and Algorithms List

 New Supported Ciphers and Algorithms
Supported SSH Ciphers
  1. aes128-ctr
  2. [email protected]
  3. aes192-ctr
  4. aes256-ctr
  5. [email protected]
Supported SSH Key Exchange Algorithms
  1. mlkem768x25519-sha256
  2. mlkem768nistp256-sha256
  3. mlkem1024nistp384-sha384
  4. diffie-hellman-group14-sha256
  5. diffie-hellman-group16-sha512
  6. diffie-hellman-group18-sha512
  7. ecdh-sha2-nistp384
  8. ecdh-sha2-nistp521
  9. ecdh-sha2-nistp256
  10. diffie-hellman-group-exchange-sha256
  11. [email protected]
  12. curve25519-sha256
Supported SSH MAC Algorithms
  1. [email protected]
  2. [email protected]

The Ciphers and Algorithms that will no longer be supported are crossed out below. 

 Current Ciphers and Algorithms
Supported SSH Ciphers
  1. aes128-cbc
  2. aes192-cbc
  3. aes256-cbc
  4. aes128-ctr
  5. aes192-ctr
  6. aes256-ctr
Supported SSH Key Exchange Algorithms
  1. diffie-hellman-group14-sha1
  2. diffie-hellman-group-exchange-sha256
Supported SSH MAC Algorithms
  1. hmac-sha1
  2. hmac-sha1-96
  3. hmac-sha256
  4. [email protected]

Timeline

MilestoneTarget DateCompleted (Yes/No)
Office Hours 1July 9, 2025Yes
QAJuly 14, 2025Yes
Office Hours 2Aug 2025Yes
CTNov. 1, 2025Yes
PRODEnd of Feb 2026No

fileX User guide has Production, QA, and CT environment details and can be found here.

FINRA Applications That Support SFTP File Transfer Method can be found here.