Cryptographic key management scheme
View Patent ↗A key management scheme for managing encryption keys in a cryptographic co-processor includes the first step of selecting a key from one of a symmetrical key type and an asymmetrical key type. Then, the key bit length is selected. The key is then generated and, lastly, the key is represented in either an external form or an internal form.
1. A method of managing encryption keys in a cryptographic co-processor, which comprises the steps of:
selecting a key type from one of a symmetrical key type and an asymmetrical key type, wherein a user selects the key type;
selecting a bit length;
generating a key, the generated key having the selected key type and the selected bit length, the step of generating a key being performed in at least one way selected from a group of ways consisting of: 1) sampling an output of a random number generator to assemble a desired length data encryption key (DEK); 2) sampling an output of a random number generator to assemble a desired length key encryption key (KEK); 3) performing a Diffie-Hellman gxy exponentiation in order to arrive at a shared secret value; 4) deriving a symmetrical secret key by hashing an application supplied password or passphrase; 5) transforming an existing key; and 6) importing an unencrypted (RED) key provided by the application; and
representing the generated key in one of an external form and an internal form, the method of managing encryption keys supporting an internally generated storage variable, a local storage variable and a user application generated KEK.