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Business communication has experienced a rapid evolution. Gone are the days when coworkers relied solely on emails to reach out to each other. Now, texts and instant messages have become acceptable and effective business communication. Still, some managers wonder, is instant messaging secure? Some apps are more secure than others, particularly those that provide end-to-end encryption.All forms of business communication come with security risks. Evaluate your business and the apps you intend to use to determine which ones pose the lowest instant messaging security issues. Consider the following options.1. SignalSignal is a free app that offers end-to-end encryption for all types of communication, including voice and video calls, texts, and group chats. It’s often hailed as the most secure messaging app you can find. Business professionals and politicians around the world rely on it. The disappearing messages feature is crucial to its success.2. WhatsAppDespite ownership by Meta, a company that has faced multiple scandals related to manipulating personal data, WhatsApp remains an industry leader. The app offers end-to-end encryption for all types of communication. WhatsApp also recently launched disappearing media and chats.3. TelegramTelegram is a cloud-based instant messaging and voice-over IP service that also offers the disappearing messages feature. Note that it only provides end-to-end encryption for secret chats. Another difference is that it’s easy to access the same chat histories across multiple devices by signing into the account. You can also manage multiple phone numbers without needing to use several devices.4. ViberViber is another popular choice that provides end-to-end encryption for all types of communication. You can use it to make calls, send voice notes, and virtually anything else you can do on WhatsApp and its competitors. The app also offers a self-destruct timer for messages, ensuring they’re only accessible for a certain period.5. Microsoft Teams ChatsMicrosoft Teams is a good choice if you’re looking for a secure option integrated into your current business software. The app offers end-to-end encryption for all types of communication and takes a zero-trust approach to cybersecurity.6. Rocket.ChatRocket.Chat is an open-source chat app that offers end-to-end encryption for all types of communication. The app is also available on various platforms, including Windows, macOS, Linux, Android, and iOS.7. Wickr MeWickr Me is a secure IM chat option that also offers end-to-end encryption for all types of communication. Like Viber, the app provides a self-destruct timer for messages. One distinguishing feature is that you don’t need a phone number or email address to use the app.How To Secure Instant MessagingChoosing the right app is the first step in mitigating instant messaging security risks. Unfortunately, some companies stop their efforts here and rely on the app’s built-in security features to keep their conversations safe. There are also

Process of determining the local data-link address from an IP address is called address resolution. Address Resolution on a Single LAN The following process describes address resolution when the source and destination devices are attached to the same LAN: End System A broadcasts an ARP request onto the LAN, attempting to learn the MAC address of End System B. The broadcast is received and processed by all devices on the LAN, including End System B. Only End System B replies to the ARP request. It sends an ARP reply containing its MAC address to End System A. End System A receives the reply and saves the MAC address of End System B in its ARP cache. (The ARP cache is where network addresses are associated with MAC addresses.) Whenever End System A needs to communicate with End System B, it checks the ARP cache, finds the MAC address of System B, and sends the frame directly, without needing to first use an ARP request. Address Resolution When Interconnected by a Router The following process describes address resolution when the source and destination devices are attached to different LANs that are interconnected by a router (only if proxy-arp is turned on): End System Y broadcasts an ARP request onto the LAN, attempting to learn the MAC address of End System Z. The broadcast is received and processed by all devices on the LAN, including Router X. Router X checks its routing table and finds that End System Z is located on a different LAN. Router X therefore acts as a proxy for End System Z. It replies to the ARP request from End System Y, sending an ARP reply containing its own MAC address as if it belonged to End System Z. End System Y receives the ARP reply and saves the MAC address of Router X in its ARP cache, in the entry for End System Z. When End System Y needs to communicate with End System Z, it checks the ARP cache, finds the MAC address of Router X, and sends the frame directly, without using ARP requests. Router X receives the traffic from End System Y and forwards it to End System Z on the other LAN. ARP and Proxy ARP Two forms of address resolution are supported by Cisco IOS XR software: Address Resolution Protocol (ARP) and proxy ARP, as defined in RFC 826 and RFC 1027,

The SAX connectionThe reader is fairly straightforward because it just reads the XML file you specify and fires off events depending on what it finds. The content handler is more complicated to implement, but not to understand, in that it just accepts the events that the reader fires off. The practical complication is that you have to create a class that implements the content handler interface and write all the event handlers that the interface specifies – even if you don't want to use them.The easiest way to understand this is to do it. So start from a new .EXE project, and add a class module called ContentHandler (or anything you like as long as you're consistent). Load a reference to Microsoft XML so that you can make use of the COM objects it provides.Next, include the statement:Implements IVBSAXContentHandler…in the general declarations section. This says that your new class will implement all of the methods defined by the IVBSAXContentHandler interface and thus it will behave as if it's a SAX content handler. In case you've never realised it, this is exactly what the Implements statement and the whole idea of "interfaces" is all about!Now you have to do exactly what you promised – you have to implement the IVBSAXContentHandler interface and this means writing a lot of "stub", i.e. empty, procedures:Private Sub IVBSAXContentHandler_characters( _ strChars As String)End SubPrivate Property Set _ IVBSAXContentHandler_documentLocator( _ ByVal RHS As MSXML2.IVBSAXLocator)End PropertyPrivate Sub IVBSAXContentHandler_endDocument()End SubPrivate Sub IVBSAXContentHandler_endElement( _ strNamespaceURI As String, _ strLocalName As String, strQName As String)End SubPrivate Sub IVBSAXContentHandler_endPrefixMapping( _ strPrefix As String)End SubPrivate Sub IVBSAXContentHandler_ignorableWhitespace( _ strChars As String)End SubPrivate Sub IVBSAXContentHandler_processingInstruction( _ strTarget As String, strData As String)End SubPrivate Sub IVBSAXContentHandler_skippedEntity( _ strName As String)End SubPrivate Sub IVBSAXContentHandler_startDocument()End SubPrivate Sub IVBSAXContentHandler_startElement( _ strNamespaceURI As String, _ strLocalName As String, strQName As String, _ ByVal oAttributes As MSXML2.IVBSAXAttributes)End SubPrivate Sub IVBSAXContentHandler_startPrefixMapping( _ strPrefix As String, strURI As String)End SubIf you enter all of these subroutines (and the one property), you'll have a working content handler – but one that doesn't do anything. In the spirit of getting something going, let's move on to using the content handler, useless though it is!Add a button on the form and add the line:Private Sub Command1_Click() Dim rdr As New SAXXMLReader40…to the click handler. This creates an instance of the SAX reader object. You can associate a single content handler with the reader via its ContentHandler property, but first we have to create a content handler: Dim cnth As New ContentHandler Set rdr.ContentHandler = cnthNow the reader and content handler are created and connected we can begin to parse an XML file. This can be done by setting the parseULR property to a file location or by using the parse property to pass XML data in a string or even in a DOM object. For this simple example we'll just pass it the name of a suitable XML file – in this case the one created using DOM in the earlier article. rdr.parseURL "\test.xml"End SubNow