---
title: SecurityMessage.CipherSuite.Version.version1
framework: accessorytransportextension
role: symbol
role_heading: Case
path: accessorytransportextension/securitymessage/ciphersuite-swift.enum/version/version1
---

# SecurityMessage.CipherSuite.Version.version1

Version 1 of the cipher suite protocol.

## Declaration

```swift
case version1
```

## Discussion

Discussion Use this value when creating SecurityMessage instances. When deriving HPKE keys on your accessory, format the protocol information as: {cipherSuite}-version1-{identifier}.