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The most well-known and officially used hash function is the Secure Hash Algorithm-1 (SHA-1) and Secure Hash Algorithm-2 (SHA-2). In recent years serious attacks have been published against SHA-1. This led the National Institute of Standard and Technology (NIST) to organize an effort to develop a modern and more secure hash algorithms through a hash function competition for usage in the following years in the near future. The selected new hash function will be called SHA-3. This keynote talk deals with the hardware implementation efficiency of SHA-3 candidates, which is one of the most critical issues, regarding the adoption of the SHA-3 standard. Comparisons, in terms of hardware terms are given in detail, throughout this talk.