Such systems are examples of public key cryptography and we will lookĪt two important algorithms, the Diffie-Hellman key exchange algorithm and the Rivest-Shamir-Adelman (RSA) public key cryptography algorithm. The key can be broken into parts so that one key can be used for encrypting and another for decrypting withoutĮver having to share a key. What's needed in order for cryptography to work on the Internet is an asymmetric system, in which System - Eve could easily intercept the key without Alice and Bob knowing, and would then be able to You can see that sending the shared key across the Internet in an email message would not be a very secure Symmetric ciphers have a serious flaw, known as theĪlice and Bob securely exchange the shared key needed to encrypt and decrypt their messages? Hopefully, ![]() ![]() That use the same key for both encryption and decryption are called symmetric cipher. Lesson, the same key was used both for encrypting and decrypting messages. This lesson focuses on the modern cryptographic systems that are used to
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