Encrypting Blocks - Siemens SIMATIC S7-400H System Manual

6.2

Encrypting blocks

S7-Block Privacy
The STEP 7 add-on package S7-Block Privacy can be used to encrypt and decrypt functions
and function blocks.
Observe the following information when using S7-Block Privacy:
● S7-Block Privacy is operated by means of shortcut menus. To view a specific menu help,
● You can no longer edit encrypted blocks in STEP 7. Moreover, testing and
● To decrypt blocks, you always need the correct key and the corresponding decompilation
● The loading of encrypted blocks is only supported on CPUs as of V6.0.
● If your project contains sources, you can use these to restore the encrypted blocks by
General procedure
To encrypt the blocks, follow these steps:
1. In STEP 7, right-click the block container and select "Block protection...".
2. The S7-Block Privacy application is started.
3. Select the block; multiple selection is supported.
4. Right-click the block to encrypt and select "Encrypt block...". The "Block encryption"
5. Select whether to include decompilation information in the encryption.
6. Enter a key string consisting of at least 12 characters in both fields. Make sure to keep
S7-400H
System Manual, 03/2012, A5E00267695-11
press the "F1" function key.
commissioning functions such as "Monitor blocks" or breakpoints are no longer available.
Only the interfaces of the encrypted block remain visible.
information included in your package. Make sure that the key is always kept in a safe
place.
means of compilation. The S7-Block Privacy sources can be removed from the project.
If you have already selected a specific block, the shortcut menu no longer contains the
"Block protection..." command.
dialog opens.
Note
If you clear the check box it will no longer be possible to decompile the block!
the key in a secure place. Click "OK" to start encryption.
Special functions of a CPU 41x-H
6.2 Encrypting blocks
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