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Kerberos v5

Posted on 2011-02-28
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Last Modified: 2012-05-11
Hi all,

just wondering what this qn means and whats the answer.

Many security tools/protocols/mechanisms, such as Kerberos V5, allow for more than one crypto-
graphic algorithm to take any particular role, such as encryption. Why do they do this, rather than
requiring the use of a particular algorithm, say AES, all the time?
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Question by:moombaz
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sjm_ee earned 500 total points
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For flexibility - encryption has been classed as military technology in certain countries at certain times and so supporting multiple options allows the framework to be used even if certain algorithms are restricted. It also allows users to switch algorithms in the future, for example if a major weakness is identified.

http://en.wikipedia.org/wiki/Kerberos_%28protocol%29

"Authorities in the United States classified Kerberos as auxiliary military technology and banned its export because it used the DES encryption algorithm (with 56-bit keys). A non-US Kerberos 4 implementation, KTH-KRB developed at the Royal Institute of Technology in Sweden, made the system available outside the US before the US changed its cryptography export regulations (circa 2000)."
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