Best Way To Send Secure Email Attachments

Best Way To Send Secure Email Attachments – Awareness of the importance of keeping your information safe is growing, and many people are now looking for ways to protect their online communications. With Google’s increasing standards for secure HTTP connections and GDPR re-emphasizing the importance of protecting your data during care and transit, the focus is on secure email, available anywhere.

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Best Way To Send Secure Email Attachments

Created in the 1960s, email was originally a means of posting messages for users on time-sharing systems. As America began to connect various organizations to the ARPANET, the use of email systems increased and became a means of sending messages and files between users in different locations. Eventually, a standard protocol for sending and receiving messages emerged from the large number of programs created to send messages, and the Simple Mail Transfer Protocol was born.

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The very nature of SMTP meant that messages (email) were sent in plain text. With the rise of the World Wide Web in the 1990s, people began looking to the security of the SMTP protocol to protect their messages from eavesdroppers. Several alternatives were explored, but the most prominent was the use of SSL/TLS for secure communications (STARTTLS).

This meant that e-mail was still sent in plain text, but over a communication channel from the e-mail client to the e-mail server. Think of it as a hidden tunnel between your email and the server, with your emails still passing through the tunnel in plain text. This adds some protection from eavesdroppers, but does not protect the email or its contents, and once that email is delivered to the first email server, it is accessible to anyone who has access to that server, and there are no guarantees. . And the end-to-end delivery is secured via TLS.

Encryption works fine in most cases. Well, different encryption methods have different vulnerabilities and different attack vectors around encryption, but in general, bits of encryption work. The problem is decoding.

If I encrypt a file or message and send it to a recipient on a public or open network, such as the Internet, I can be sure that other people intercepting the message or file cannot read it without being able to. To decode it first. But the same problem is with the intended recipient of an email or file, who also needs to know how to decrypt it before reading it.

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So the first problem is that the recipient knows what technique I used to encrypt the file. Since our devices do not have built-in encryption (which can be used to send files or e-mail) or a single standard form of encryption, both the sender and receiver must agree on the technology used beforehand.

The second problem is getting the key that the recipient needs to decrypt the email or file in a way that would make it useless to anyone who tampers with it.

Some of these encryption methods use public key encryption (also known as PKE, PKC (public key cryptography), or asynchronous encryption), where you share the public part of your encryption certificate with everyone but anyone you send information to. , needs it. Encryption certificate. The other is password-based encryption (also known as synchronous encryption, which is used to encrypt and decrypt the same password object), where you require the recipient to receive a copy of the password in separately encrypted files. (See note on passwords below)

If you want to encrypt the entire email, meaning the email content and attachments, there are several options available.

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Developed in 1995, it is one of the MIME secure data standards, so your email client may already have some means of implementing S/MIME encryption.

MIME (Multipurpose Internet Mail Extensions) was originally developed to enhance ASCII text-only email. It allowed e-mails to add audio, video, and other images, multi-layer messages (such as plain text and HTML), and expanded header information, hidden information used by e-mail systems to provide additional functionality.

S/MIME uses certificates to authenticate the sender and recipient, with different classes of certificates providing different levels of owner authentication.

A basic certificate, class 1, verifies the ‘from’ field/proves nothing else about the sender. This means that the recipient knows that the email is not from a fake address or that the sender is trying to hide their identity.

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Class 2 certification offers more in-depth certification. The identity of the person and/or organization is also verified before issuing a Level 2 certificate.

Certificates (or keys) are issued from a trusted global supplier and placed on the network of servers of certification authorities for public access, these are secure directories of public keys (public key (public key encryption)) is part of your certificate. For all, thus the public part , and together with the private part of the key is used to encrypt and decrypt messages)

OpenPGP is an encryption standard developed to enable interoperability of OpenPGP-compliant software. It also uses public key encryption to encrypt/decrypt messages.

Many applications now use OpenPGP to provide encryption for more than just email, such as instant messaging, full disk encryption, file sharing, and web services.

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Looking only at email and file encryption apps, there are plenty of apps for Mac, Linux, Windows, iOS, and Android that are compatible.

OpenPGP differs from S/MIME in the way certificates are presented. Instead of a trusted authority server with a public key registry, PGP uses WOT (Web of Trust) to determine the authority of any certificate. Because certificates are trusted by users, that information is transmitted to other recipients with whom they communicate, spreading the trust level of the certificate from user to user.

Newer versions of OpenPGP have the ability to create certificate authorities for S/MIME implementations, not only verifying that the key belongs to its owner, but that the owner is trusted and can sign trust-level keys for itself.

While OpenPGP and S/MIME offer e-mail signing, it is not a form of encryption and e-mail is still sent in plain text.

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A digital signature, used in an email signature, is a way to verify the sender’s email address and that the email arrived intact along the way.

Emails are signed with the sender’s private key. When it is received, the recipient downloads a copy of the sender’s public key (either sent with the message, available through WOT or from one of the certificate directories) and can use it to verify the integrity of the email.

(not the sender) and the integrity of the email (it has not been compromised between sender and recipient) does not guarantee that the sender or company is who they claim to be. This means that you can be sure that the sender had access to the email address it came from (it wasn’t a scam), but not that the email address represents the sender. For example, a sender can set up an email account [email protected] and ownership of that address is verified by a signed certificate, there is no verification that it was actually Joe Bloggs who set up the address.

If you only want to encrypt the files you send and not the actual email, file encryption is the way to go. Most devices still require both the sender and receiver to install the app, and there must be a password or certificate exchange.

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As we mentioned earlier, if you use a password key to encrypt a file, the strength of the encryption ultimately depends on how strong the password is and how difficult it is to decipher.

Strong passwords have a mix of upper and lower case letters, numbers and punctuation, string words to make longer passwords, and don’t use the same password twice!

An example of a good password might be Micra/AB56DNW#[email protected] your car model in uppercase, your car registration in uppercase, the last part of your phone number and your work postcode in lowercase.

If you share files with your clients, you can agree on the system so that you don’t have to send the password to your client every time. You would probably recommend using the customer reference number, followed by the # and the date the email was sent in 8 digits, followed by / and then the postal code of the customer’s office in lower case, which might work.

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