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Ingenico 6500 User’s Guide 93
Figure 4 Key Architecture
9.2 Sponsor Key (KTK)
Key Name Index Length Description of Key
Sponsor key (KTK,
key transfer key,
also known as
TMK)
0 16 This key will be loaded as clear text. All Level
2 keys will be transferred to the debit terminal
encrypted under this key. A default key is set if
no customer key is injected.
9.3 Terminal Based Keys
Key Name Index Length Description of Key
Secure Text Entry
Form Authorization
Key (PEFMK)
1 8/16 This key is loaded encrypted under the KTK.
All prompts and/or screens used for Secure
Text Entry of all applications will be
authenticated using this key if the Prompts
Authentication Key security option is set to
terminal based (0).
Clear Text Entry
Form Authorization
Key (CEFMK)
2 8/16 This key is loaded encrypted under the KTK.
All prompts and/or screens used for Clear Text
Entry of all applications will be authenticated
using this key if Prompts Authentication Key
security option is set to terminal based (0).
Application
Download
Authorization Key
(CDMK)
3 8/16 This key is the variant of KTK. It will be used to
verify the MAC value of the fingerprint of the
code being downloaded into the device. Code
MACing always uses the Application
Download Authorization Key.