3213334 - PI PGP error - "A fitting private key for the encrypted data could not be found: check the password"

• Message processing via SFTP Sender Adapter with PGP module fails with following error in the Communication Channel Monitor: 
  ERROR_IN_MODULECHAIN, PGPDecryption Module: or ERROR_IN_MODULECHAIN, PGPEncryption Module: 
• If the XPI trace is collected (see Reproducing the Issue section below), this error presents: 
  Error while decrypting/verifying the message. Error: org.bouncycastle.openpgp.PGPException: A fitting private key for the encrypted data could not be found: check the password.. Cause: <null>
   with (org.bouncycastle.openpgp.PGPException: A fitting private key for the encrypted data could not be found: check the password., Check private key password) 
  
• Note: same can occur with any Adapter type where the PGP module is used. 

SAP Netweaver 7.5

org.bouncycastle.openpgp.PGPException: A fitting private key for the encrypted data could not be found: check the password, PGP, PGP Encryption, PGP Decryption, A fitting private key for the encrypted data could not be found, fitting private key for the encrypted data could not be found: check the password, HTTP_AAE Adapter , KBA , BC-XI-CON-SFT , Secure File Transfer Protocol Adapter , Problem