Advanced users • Raspberry Pi Secure Boot Key Lengths

Hi,

I have a Raspbbery Pi 5 and implemented Secure Boot according to the documentation.
Now I found in the documentation:

An RSA (Rivest–Shamir–Adleman) key pair is required to sign the electronically erasable programmable read-only
memory (EEPROM) and the boot image.

In the examples there is always a rsa2048 key used. Now I wonder If other key lengths are also supported (e.g. rsa4096). If yes how must the boot.img.sig file look for e.g. rsa4096.

Statistics: Posted by Greschi — Thu Jan 08, 2026 4:39 pm — Replies 1 — Views 21

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