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How would they know that their efforts are resulting in the correct original value?Could someone even recognize that the values are encrypted? You're correct that the values would all appear to be valid dates (this is known as format-preserving encryption, by the way), so they would not look to let them guess whether they're plausible or not, they might not notice anything amiss.This is also easily detectable, although recovering the key may be more — possibly much more — difficult.) In fact, the methods to use for breaking your cipher are basically the same as one would use to break a simple Caesar cipher.
String key Id = "arn:aws:kms:us-west-1122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab"; Byte Buffer plaintext = Byte Buffer.wrap(new byte); Encrypt Request req = new Encrypt Request()Key Id(key Id)Plaintext(plaintext); Byte Buffer ciphertext = kms.encrypt(req)Ciphertext Blob(); To decrypt an encrypted data key, and then immediately re-encrypt the data key under a different customer master key (CMK), use the Re Encrypt operation.
The Generate Data Key and Generate Data Key Without Plaintext operations return encrypted data keys.