3040476 - Messages using PGP module are failing with "java.lang.ClassCastException" while encrypting/decrypting

You have a Process Integration (PI) or Process Orchestration (PO) system with a scenario where PGP Module is used to encrypt or decrypt files. During message processing, the following errors are visible (one or another):

• Error: java.lang.ClassCastException: org.bouncycastle.crypto.params.RSAKeyParameters (loaded by com.sap.engine.boot.loader.ResourceMultiParentClassLoader@0x00000007f0322d20) cannot be cast to org.bouncycastle.crypto.params.DSAPublicKeyParameters (loaded by com.sap.engine.boot.loader.ResourceMultiParentClassLoader@0x00000007f0322d20). 
• Error: java.lang.ClassCastException: org.bouncycastle.crypto.params.DSAPublicKeyParameters (loaded by com.sap.engine.boot.loader.ResourceMultiParentClassLoader@0x00000007f0069ed8) cannot be cast to org.bouncycastle.crypto.params.RSAKeyParameters (loaded by com.sap.engine.boot.loader.ResourceMultiParentClassLoader@0x00000007f0069ed8). 

• SAP Process Integration, secure connectivity add-on

SFTP, PGP, Secure Connectivity, Addon, Add-on, Process Integration 7.0, PI 7.0, PI 7.01, PI 7.02, Process Integration 7.10, PI 7.10, Process Integration 7.11, PI 7.11, Process Integration 7.30, PI 7.30, Process Integration 7.31, PI 7.31, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, , KBA , BC-XI-CON-SFT , Secure File Transfer Protocol Adapter , Problem