---
title: SecurityMessage.CipherSuite.p256
framework: accessorytransportextension
role: symbol
role_heading: Case
path: accessorytransportextension/securitymessage/ciphersuite-swift.enum/p256
---

# SecurityMessage.CipherSuite.p256

A cipher suite that uses NIST P-256 elliptic curve cryptography.

## Declaration

```swift
case p256
```

## Mentioned in

Receiving iOS notifications on an accessory

## Discussion

Discussion Use this cipher suite as a fallback for Bluetooth only. The AccessoryTransport.internet or AccessoryTransport.localNetwork transport types require SecurityMessage.CipherSuite.xWing instead.

## See Also

### Identifying cipher suite types

- [SecurityMessage.CipherSuite.xWing](accessorytransportextension/securitymessage/ciphersuite-swift.enum/xwing.md)