1. Open Key Management under Data Management in the Administration section of your account.
2. To create a symmetric key, provide the required information. Generate the key value for the pre-shared key field using a cryptographically secure random number generator. Marketing Cloud supports AES 256 encryption. Use a 64-character hexadecimal string for the key. Your internal team can provide information obtaining the key.
3. Save your key and return to the Key Management page.
4. To create an initialization vector (IV), provide the required information. Use a 32-character hexadecimal string for the IV value.
5. Save your IV.