Firewalls are designed basically for restricting the unauthorized traffic by dissecting packets at the perimeter level that are flowing to and fro from the internal network. Implementation of firewall as a network perimeter defense makes the environment bulletproof. For example, SSL does not protect us from Man-in-the-Browser (MitB) attacks in which attackers steal the data way before it is encrypted by the SSL. SSL does not provide any protection against malware that resides in the end-user system. The truth is that SSL does not protect you from all types of data-stealing attacks. These attacks help the attackers to hijack the encrypted communication channels and decrypt them accordingly to retrieve or inject plaintext data. SSL provides defense against network attacks including interception and injection attacks in the network known as Man-in-the-Middle (MitM).
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