# Message Protection Provide cryptographic protection to secure message integrity. ## Topics ### Message Wrapping and Verification Apply a Message Integrity Code (MIC) to a message to guarantee its integrity. Ensure confidentiality using encryption and decryption. [`gss_get_mic`](/documentation/GSS/gss_get_mic(_:_:_:_:_:)) Returns a token that contains the MIC for a message. [`gss_verify_mic`](/documentation/GSS/gss_verify_mic(_:_:_:_:_:)) Returns an indication of whether the integrity of a message is intact, given its MIC token. [`gss_wrap`](/documentation/GSS/gss_wrap(_:_:_:_:_:_:_:)) Returns a secure message created by calculating and attaching a MIC to the input message, and then optionally encrypting it. [`gss_unwrap`](/documentation/GSS/gss_unwrap(_:_:_:_:_:_:)) Returns the original version of a secure message by optionally decrypting it and then extracting and verifying the attached MIC. [`gss_sign`](/documentation/GSS/gss_sign(_:_:_:_:_:)) Returns a digital signature for a message. [`gss_verify`](/documentation/GSS/gss_verify(_:_:_:_:_:)) Returns a flag that indicates the integrity of a message’s digital signature. [`gss_seal`](/documentation/GSS/gss_seal(_:_:_:_:_:_:_:)) Returns a secure message created by calculating and attaching a MIC to the input message, and then optionally encrypting it. [`gss_unseal`](/documentation/GSS/gss_unseal(_:_:_:_:_:_:)) Returns the original version of a secure message by optionally decrypting it and then extracting and verifying the attached MIC. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)