ccna after security+

ccna after security+.far better than the losing side. Now, cryptographers are considered to be in the lead.7.1.4.2 CryptanalysisCryptanalysis is often used by governments for military and diplomatic surveillance, by corporations to test the strength of security programs, and by malicious hackers to break vulnerabilities in websites.Although cryptanalysis is often associated with malicious purposes, it is actually a necessity. Cryptography has the ironic fact that it is impossible to prove that an algorithm is secure, only that an algorithm is not subject to known cryptanalytic attacks. Therefore, it takes mathematicians, academics, and security forensics to continuously attempt to break cryptographic methods.7.1.4.3 The secret is the keyIn the world of communication and networking, authentication, integrity, and data confidentiality are implemented in a variety of ways using different protocols and algorithms. The choice of protocols and algorithms varies depending on the level of security that needs to be achieved to meet the objectives of the network security policy. For example, for message integrity, message-digest5 (MD5) is faster than SHA2, but less secure than SHA2o confidentiality can be implemented using DES, 3DES, or the very secure AES. The choice to make depends on the security requirements specified in the network security policy document.Older encryption algorithms, such as the Kaiser cipher and Enigma machines, gain confidentiality based on the security of the algorithm. Public domain algorithms are often used in modern techniques that make reverse engineering a breeze. In the latest algorithms, successful decryption requires knowledge of the correct key. This means that the security of encryption lies in the security of the key, not the algorithm.So how can the key be kept secure?7.2 Basic Integrity and Authenticity7.2.1 Cryptographic hashing