A system and method for providing key challenge validation is provided. In example embodiments, an initiation of a transaction is detected and a challenge comprising a string of characters is generated based on the detection. The string of characters includes transaction specific information indicating a detail of the transaction. The challenge is presented whereby the string of characters includes a challenge key. A response to the challenge is received that includes the challenge key. In various example embodiments, the transaction is validated based on an identification of the key challenge of the string of characters.