# HEADER_CHUNK_COUNT

> `const` **HEADER\_CHUNK\_COUNT**: `-65791` = `-65791`

Defined in: [packages/filecoin-encryption-envelope/src/constants.ts:36](https://github.com/FilOzone/synapse-sdk/blob/4fe24ea1c76c9b1fa1489b7cdbb1cc279bd2576a/packages/filecoin-encryption-envelope/src/constants.ts#L36)

`chunk_count`, private use (RFC 9052 §3.1). Present only when the content
length was known at encryption time. See docs/tech-spec.md, "chunk_count
and truncation" — this label lives in the *protected* header so an
attacker cannot edit it to mask a truncated object without failing every
chunk's AEAD tag.