Editing Padding (cryptography) (section)

=====ANSI X9.23=====

In ANSI X9.23, between 1 and 8 bytes are always added as padding. The block is padded with random bytes (although many implementations use 00) and the last byte of the block is set to the number of bytes added.<ref>{{cite web |title=ANSI X9.23 cipher block chaining |url=https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.wskc.doc/wskc_c_l0wskc58.html |website=IBM Knowledge Center |publisher=IBM |access-date=31 December 2018}}</ref>

Example:
In the following example the block size is 8 bytes, and padding is required for 4 bytes (in hexadecimal format)

 ... | DD DD DD DD DD DD DD DD | DD DD DD DD '''00 00 00 04''' |