Cryptographic Protocol

This chapter describes the cryptographic design of the Penumbra protocol, described in more detail in the following sections:

  • The Notes section describes Penumbra’s private notes and their contents.

  • The Transaction Cryptography section describes the symmetric keys used at the level of an individual transaction.


We use the following notation in this chapter:

  • denotes the decaf377 group;
  • denotes the BLS12-377 scalar field of order ;
  • denotes the decaf377 scalar field of order .