Postbank, the banking division of South Africa’s Pat Office, recently reported that a rogue employee stole 36-digit master keys used to protect the bank’s systems.  The result: 25,000 fraudulent charges valued at 56 million Rand (3.2 million US dollars) and 1 billion Rand (58 million US dollars) to replace all credit and ATM cards issued by the bank.

Source: https://www.informationsecuritybuzz.com/expert-comments/postbank-data-breach-the-importance-of-managing-cryptographic-keys-expert-source/