List of Used Keys
Following keys are used in the PowerAuth cryptography scheme.
| name | created as | purpose |
|---|---|---|
KEY_DEVICE_PRIVATE |
ECDH - private key | Generated on client to allow construction of KEY_MASTER_SECRET |
KEY_DEVICE_PUBLIC |
ECDH - public key | Generated on client to allow construction of KEY_MASTER_SECRET |
KEY_SERVER_PRIVATE |
ECDH - private key | Generated on server to allow construction of KEY_MASTER_SECRET |
KEY_SERVER_PUBLIC |
ECDH - public key | Generated on server to allow construction of KEY_MASTER_SECRET |
KEY_SERVER_MASTER_PRIVATE |
ECDH - private key | Stored on server, used to assure authenticity of KEY_DEVICE_PUBLIC while transferring from server to client |
KEY_SERVER_MASTER_PUBLIC |
ECDH - public key | Stored on client, used to assure authenticity of KEY_DEVICE_PUBLIC while transferring from server to client |
KEY_MASTER_SECRET |
ECDH - pre-shared | A key deduced using ECDH derivation, KEY_MASTER_SECRET = ECDH.phase(KEY_DEVICE_PRIVATE, KEY_SERVER_PUBLIC) = ECDH.phase(KEY_SERVER_PRIVATE, KEY_DEVICE_PUBLIC) |
KEY_SIGNATURE_POSSESSION |
KDF derived key from KEY_MASTER_SECRET |
A signing key associated with the possession, factor deduced using KDF derivation with INDEX = 1, KEY_SIGNATURE_POSSESSION = KDF.expand(KEY_MASTER_SECRET, 1), used for subsequent request signing |
KEY_SIGNATURE_KNOWLEDGE |
KDF derived key from KEY_MASTER_SECRET |
A key associated with the knowledge factor, deduced using KDF derivation with INDEX = 2, KEY_SIGNATURE_KNOWLEDGE = KDF.expand(KEY_MASTER_SECRET, 2), used for subsequent request signing |
KEY_SIGNATURE_BIOMETRY |
KDF derived key from KEY_MASTER_SECRET |
A key associated with the biometry factor, deduced using KDF derivation with INDEX = 3, KEY_SIGNATURE_BIOMETRY = KDF.derive(KEY_MASTER_SECRET, 3), used for subsequent request signing |
KEY_TRANSPORT |
KDF derived key from KEY_MASTER_SECRET |
A key deduced using KDF derivation with INDEX = 1000, KEY_TRANSPORT = KDF.expand(KEY_MASTER_SECRET, 1000), used for encrypted data transport. This key is used as master transport key for end-to-end encryption key derivation. |
KEY_ENCRYPTION_VAULT |
KDF derived key from KEY_MASTER_SECRET |
A key deduced using KDF derivation with INDEX = 2000, KEY_ENCRYPTION_VAULT = KDF.expand(KEY_MASTER_SECRET, 2000), used for encrypting a vault that stores the secret data, such as KEY_DEVICE_PRIVATE. |
KEY_TRANSPORT_IV |
KDF derived key from KEY_TRANSPORT |
A key deduced using KDF derivation with INDEX = 3000, KEY_ENCRYPTION_IV = KDF.expand(KEY_TRANSPORT, 3000), used for derivation of initial vector, that encrypts activation status blob. |
KEY_TRANSPORT_CTR |
KDF derived key from KEY_TRANSPORT |
A key deduced using KDF derivation with INDEX = 4000, KEY_TRANSPORT_CTR = KDF.expand(KEY_TRANSPORT, 4000), used for computing hash from current value of hash-based counter. |
Last updated on May 26, 2020 (20:09)
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