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cryptographic analysts grows, many previously developed hash functions are rendered less effective, and the key sizes that were previously deemed long enough seem too short to provide adequate protection against cryptographic attacks. The hash function design can be compared to clothing out of fashion industry: they are both cool when they come out and pass a few years later, with the difference that the hash functions tend to not make any comebacks. That could (only a guess) be due to a more vivid imagination of hackers and cryptographers in their own field even though they typically have an unusual sense of fashion. With all that digression, it should now be obvious that when providing integrity protection, the need for replacing the less secure hash functions with the new and more secure ones existed frequently. For those reasons, providing a framework that defines the usage of a generic hash function was deemed useful. A framework developed by IETF, called HMAC [HMAC2104], enables the designers and implementers to deploy any generic keyed hash function for a generation of MACs. We provide an overview of the HMAC framework in the following. In order to prove that the message is authentic, the sender compresses the data to be protected using a hash algorithm (H). If the data is too long, it may be divided into blocks of B-octets long and then fed into the hash function, which produces an output value of length L (L = 16 bytes by MD5 and L = 20 for SHA1). HMAC = H(K opad, H(K ipad, M)) where, the K is the secret key shared between the sender and the receiver of the message (M). To maintain a minimum strength for the security of the HMAC procedure, the HMAC specification recommends that the key length is at least as large as the length of the output of the hash function (L). The ipad and opad simply refer to the inner and outer padding applied to the original message, respectively and are simply constant values that have the same length as the input data:
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ipad is the one-byte value of 0 36 ( stands for hexadecimal notation) repeated B times (to make B bytes). opad is the value of 0 5C repeated B times.
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Now that we have gone through the details of HMAC calculations, for the rest of this book we use the following simplified form to refer to an HMAC calculated over a message M, using a key K: HMAC(K, M) The sender simply appends the calculated HMAC value to the message M, before sending the message to the receiver: M, HMAC(K, M) As shown above, the HMAC specification abstracts the exact details of the hash function (or choice of hash function in case of those who are not cryptographers and cannot design hash functions the way RSA folks did) out. Any hash function that is deemed cryptographically suitable for any future computing platform and/or communications scenario can be inserted in the process of calculating the HMAC and hence the security the HMAC process is always
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is good as the hash function being used. At the time of generation of the RFC, there were many candidates for the hash function to use. Since then MD5 and recently secure hash algorithm (SHA1) [SHANIST] have gained the most popularity. When the HMAC framework is used with MD5 as the hash algorithm, it is typically referred to as HMAC-MD5. It should be noted that at time of this writing usage of HMAC-MD5 is being discouraged for applications with high security requirements. NIST is requiring the use of SHA1 with at least 128-bit long keys in conjunction with the HMAC protocol (HMAC-SHA1) for federal government applications. Regardless of the hash algorithm being used with HMAC protocol, the HMAC protocol is a wide and powerful tool in security design to provide not only authentication of a message or an entity (the holder of the key), but also anti-replay protection. The following is a generic form of what one may come across in many signaling procedures: HMAC(Key, information, nonce) The purpose of the key is to provide assurance of integrity of the data, since the key is only known to the sender and the receiver. However, the nonce is not a secret value and is simply a value that is used only once to provide the so-called anti-replay protection. A replay attack is when an illegitimate party records a message between two other entities and replays the message at a later point acting as the original sender. Using each nonce value only one time ensures the receiver that the message is not a replayed version of older message.
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