In Norse mythology, Heimdall is the gatekeeper of Bifröst, the rainbow road connecting Midgard, realm of the humans, to Asgard, the realm of gods.
In iOS, Heimdall serves as a gatekeeper between Security framework and the UI, offering a nice wrapper around the C APIs for encrypting, decrypting, signing and verifying messages.
Furthermore, Heimdall also helps maintain the public-private RSA key-pair in Keychain, allowing both creating as well as deleting the key pairs.
