Participants can behave in an undesirable and fraudulent manner in an attempt to gain an advantage at the expense of rivals. However, are many inherent security and fairness concerns. Online auctions are a popular means for exchanging items over the Internet. Avenues for future research are proposed with regard to the present lacking state of commercial online auction security. We show that most schemes are currently not practical and there are conflicting perspectives regarding security requirements. This paper supports supplementary research by the author into online auction fraud and security issues. The paper's motivation is to give an all-encompassing overview of auction privacy and security, which has not been documented elsewhere. We provide a uniform analysis of each auction scheme's functional components and analyse the efficiency of the security mechanisms. The major auction types are investigated and their privacy and security requirements contrasted. This paper presents a survey of cryptographic schemes that have been proposed for conducting private and secure auctions. This makes it difficult to construct schemes to prevent all possible forms of dubious behaviour. However, different auction types have differing security requirements. Cryptographic protocols can be applied to help alleviate some of these problems. Online auctions are inherently insecure and there exist many opportunities for participants to cheat.
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