What is the NSA's Suite A & B?

National Security Agency (NSA) has identified a number of cryptographic methods to be used for protecting especially sensitive information—Suite A cryptography. The NSA’s “Suite A” contains classified algorithms that can only be deployed on controlled devices. Since these algorithms are secret, the use of devices that include them is very limited, since in addition to protecting the information, the algorithms must be protected as well.

On the contrary, the Vernam cipher is well-known and does not need protection, providing the level of security, when properly used, that exceeds the NSA’s Suite A cryptography, being the only mathematically unbreakable encryption.

The NSA's Suite B cryptography, instead, is a set of commercially available encryption algorithms that can be used for commercial applications as well as for certain types of classified information. The Sute B also serves as an interoperable cryptographic base for both unclassified and classified information.



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