A member of
Eurex Clearing
1. Introduction
Deutsche Börse continuously strengthens its SSH server security by updating configurations and deactivating outdated ciphers, key exchange algorithms, and MAC algorithms.
To ensure secure and reliable connectivity to the Common Report and Upload Engine (CRE & CUE), Deutsche Börse will remove the deprecated “SSH rsa” key type and the “Diffie Hellman Group 14 with SHA-256 hash” Key Exchange Method from its SSH 2.0 connectivity suite, effective 31 August 2026.
2. Required action
To access CRE and CUE, Clearing Members must upload a compliant SSH key in the Member Section. The following key types are supported:
A. Ed25519 (Edwards Curve 25519)
Modern elliptic curve key and signature algorithm based on EdDSA/Curve25519.
Offers strong cryptographic security, small key sizes and fast authentication.
B. OpenSSH SSH 2 RSA (minimum 4096 bits)
Must use SHA256, SHA384, or SHA512 as the signature algorithm.
No maximum key length is defined.
Clearing Members must ensure that all SSH keys fully comply with the current CRE/CUE security requirements. Non-compliant keys must be replaced. Clearing Members remain responsible for maintaining secure key management practices.
3. Details of the initiative
The above-mentioned changes will be transparent for users of standard SFTP or SSH clients. However, participants using scripts with hard coded key types or Key Exchange Methods must review and update their scripts accordingly.
Please note:
Unless the context requires otherwise, terms used and not otherwise defined in this circular shall have the meaning ascribed to them in the Clearing Conditions or FCM Clearing Conditions of Eurex Clearing AG, as applicable.
Further information
Recipients: | All Clearing Members, ISA Direct Clearing Members, Disclosed Direct Clients, all FCM Clearing Members of Eurex Clearing AG and vendors |
Target groups: | Front Office/Trading, Middle + Backoffice, IT/System Administration, Auditing/Security Coordination |
Contact: | Your Technical Key Account Manager via VIP number or cts@deutsche-boerse.com |
Web: | www.eurex.com/ec-en/ |
Authorized by: | Manfred Matusza |