IBM Aspera HST Admin Manual page 188

Field Description
Cipher Values
Value
AES128
AES192
AES256
AES128CFB
AES192CFB
AES256CFB
AES128GCM
AES192GCM
AES256GCM
NONE
Client-Server Cipher Negotiation
The following table shows which encryption mode is used
depending on the server and client versions and settings:
Client,
v3.9.0+
AES-XXX-
GCM
Client,
v3.9.0+
AES-XXX-
CFB
Client,
v3.9.0+
AES-XXX
Client,
v3.8.1 or
older
AES-XXX
Description Support
Use the GCM or CFB All client and server
encryption mode, versions.
depending on the server
configuration and version
(see cipher negotiation
matrix).
Use the CFB encryption Clients version 3.9.0
mode. and newer, all server
versions.
Use the GCM encryption Clients and servers
mode. version 3.9.0 and newer.
Do not encrypt data in All client and server
transit. Aspera strongly versions.
recommends against
using this setting.
Server, Server, Server,
v3.9.0+ v3.9.0+ v3.9.0+
AES-XXX- AES-XXX- AES-XXX
GCM CFB
GCM server GCM
refuses
transfer
server CFB CFB
refuses
transfer
GCM CFB CFB
server CFB CFB
refuses
transfer
| Watch Folders and the Aspera Watch Service | 188
Default
Server,
v3.8.1 or
older
AES-XXX
server
refuses
transfer
CFB
CFB
CFB