ATMKeyDwnldRspn
                Mandatory
                Hdr
                Mandatory
                PrtctdATMKeyDwnldRspn
                Optional
                ATMKeyDwnldRspn
                Optional
                SctyTrlr
                Optional
                CnttTp
                Mandatory
                AuthntcdData
                Optional
                Vrsn
                Optional
                Rcpt
                Repetition (1..n)
                KeyTrnsprt
                Choice
                KEK
                Choice
                Vrsn
                Optional
                KEKId
                Mandatory
                KeyNcrptnAlgo
                Mandatory
                Algo
                Mandatory
                Param
                Optional
                NcrptnFrmt
                Optional
                InitlstnVctr
                Optional
                Byte Padding
BPddg
                Optional
                Definition: Byte padding for a cypher block chaining mode encryption, if the padding is not implicit.
Type: BytePadding1Code (String)
Allowed Values:
- LNGT (Length Padding): Message to encrypt is completed by a byte value containing the total number of added bytes. NUL8 Null80Padding Message to encrypt is completed by one bit of value 1, followed by null bits until the encryption block length is reached.
- NUL8
- NULG (Null Length Padding): Message to encrypt is completed by null byte values, the last byte containing the total number of added bytes.
- NULL (Null Padding): Message to encrypt is completed by null bytes.
- RAND (Random Padding): Message to encrypt is completed by random value, the last byte containing the total number of added bytes.
NcrptdKey
                Mandatory
                KeyIdr
                Choice
                MACAlgo
                Mandatory
                NcpsltdCntt
                Mandatory
                MAC
                Mandatory
                SgndData
                Optional