Sometimes crypto libraries have bugs, but it's also easy to use them incorrectly, especially if you don't have an good understanding of cryptography. For examp

Sometimes crypto libraries have bugs, but it's also easy to use them incorrectly, especially if you don't have an good understanding of cryptography. For example, a common mistake is to assume that by encrypting something, attackers can no longer change it. Or perhaps you'll use your standard equality operation to check whether a decrypted string matches some value, without thinking about timing attacks. Or maybe you'll just use AES in ECB mode.