A system and method of providing and validating a bar-code on a lottery ticket to allow secure verification of tickets is described. Lottery ticket information comprising unique identifying information uniquely identifying the lottery ticket and validation information for use in determining a prize value associated with the lottery ticket is generated. First redundancy information is generated using the validation information and a portion of the unique identifying information. The first redundancy information used for checking the integrity of subsequently received validation information. The validation information is encrypted and second redundancy information is generated using the unique identifying information and the encrypted validation information. A first bar-code is constructed using the unique identifying information, the encrypted validation information and the second redundancy information. The first bar-code is printed on the lottery ticket and at least a part of the first bar-code is covered with scratch-off material.