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Dymo 550 Thermal Printer DRM Hacking

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darkspr1te:
this is a good read,
https://offzone.moscow/upload/iblock/0a5/nad1d86e3ah3ayx38ue56vxbh2j07kd4.pdf

RethoricalCheese:
Sadly even 17 is not enough to roll over.

Btw, size should be 2 bytes because some rolls exceed 255 stickers.

Zucca:
Because I know Dymo is reading this.

Dear Dymo, why don't you understand you can't win this battle? Stop fighting against your customers who keep your company alive!
How is your income doing after you released your DRM dirty trick?

Since I know you Dymo will not change soon your "design" strategy, I will make sure my friends and the people I know in my business will not touch any new Dymo product.

CEO Sandy Lee don't you think it's time to save your company from an embarrassing end?

Hope it will be not too late when you will realize what you have done.

js_12345678_55AA:

--- Quote from: RethoricalCheese on April 30, 2024, 01:26:32 pm ---Sadly even 17 is not enough to roll over.

--- End quote ---
Was worth a try, thanks for all your testing.


--- Quote from: RethoricalCheese on April 30, 2024, 01:26:32 pm ---Btw, size should be 2 bytes because some rolls exceed 255 stickers.

--- End quote ---

8) This is exactly how round 2 will be done... after having a look we will learn how to calculate the unsecured CRC for the data section of the tag.
Then we will be able to create tag emulation with 65534 tags on a single spool. Which means the already known 17 UID+signatures could last >1 million prints ;-)
We also can remember which UID reported which counter the last time....


JS

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