The security of encryption against unauthorized decryption, unauthorized changing of the data, etc. Security should depend completely on the key. One distinguishes between the following two types of security:
Computational security: quantitative security against unauthorized decryption, based on particular (usually mathematical) assumptions like the inherent difficulty of factoring sufficiently long numbers. Often a security parameter denotes the computational level of the security.
Unconditional security: security against unauthorized decryption assuming that the cryptanalyst has unlimited computing facilities (so, security in an information theoretic sense).
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References
Menezes, A.J., P.C. van Oorschot, and S.A. Vanstone (1997). Handbook of Applied Cryptography. CRC Press, Boca Raton, FL.
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© 2005 International Federation for Information Processing
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Bauer, F.L. (2005). Security. In: van Tilborg, H.C.A. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA . https://doi.org/10.1007/0-387-23483-7_376
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