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cisco dumps reddit.6.2 Cryptography 301Figure 6.4 Registering the CA's digital certificateBatman and Robin both trust the CA, and both receive their certificates from the CA.Batman first "takes out" a packet and generates a hash, then encrypts the short hash with his own private key (if you think of encryption as locking a container, then Batman is inserting the small key into the small lock hole and locking the hash inside). Batman then attaches the encrypted hash to the packet and sends it to Robin. The encrypted hash has a strange name - digitalsignature.After receiving the packet, Robin extracts the encrypted hash and decrypts it with Batman's public key (think of it as Robin inserting the big key into the big lockhole, opening the container, and removing the hash). Robin then sets the decrypted hash aside and performs the same hashing algorithm as Batman, generating a hash for the packet he just received. If the newly generated hash matches the decrypted hash, then Robin can be sure of two things: the person who encrypted that hash must be Batman, and it was Batman who encrypted it with his own private key; the integrity of that packet can be guaranteed, because even if the contents of the packet were modified by only one bit, the two hashesAt this point, the reader may ask how Robin could have Batman's key (Batman's public key). The answer is that Batman and Lo302 Chapter 6 Cryptography and Public Key Infrastructure (PKI) BasicsSecurity Pay load), which has all the features of IPSec; AH stands for Authentication Header, which has some of the features of IPSec, but does not support the most important feature of IPSec (encrypting data). Therefore, AH is not commonly used.Robin also exchanges digital certificates containing his public key with each other. While Batman and Robin do not trust any certificates, since both trust CAs,they naturally trust certificates that have been digitally signed by CAs. This means that to verify the digital signature from the CA, both Batman and Robin need the CA's public key. Today, most browsers and operating systems have built-in certificates and public keys from the leading CAs on the Internet. Figure 6-5 shows the System Roots key chain on macOS.Na Acjiass