What Application of Encryption Verifies That a Document Was Sent by The Person it Says it is From?

Privacy is a vital component of online communication, and one of the most important aspects of privacy is ensuring that the documents you send are not altered or spoofed in transit. To do this, you need to be able to verify that the document was sent from the person it says it was sent from. In this article, we will explore how encryption can help with this verification task.

What is hash algorithm?

Hash algorithms are used to create digital signatures. A hash algorithm takes a piece of data, such as a document, and creates a unique string or number from it. Then, the hash algorithm can be used to verify that the data was actually created by the person or program it says it was created by.

There are many different types of hash algorithms, but the three most common ones are MD5, SHA-1, and SHA-256. MD5 is the algorithm used by Twitter and Facebook to create digital signatures. SHA-1 is the algorithm used by Google Docs and Gmail to create digital signatures. SHA-256 is the algorithm used by Bitcoin and other cryptocurrencies to create digital signatures.

How Encryption Works?

Encryption is a process of transforming readable data into an unreadable format. This, in turn, makes it difficult to access the document unless the right key is used. The key is a string of letters and numbers that allow the recipient of the encrypted document to decrypt it.

There are many different encryption algorithms available, each with its own strengths and weaknesses. One example of an encryption algorithm is the AES algorithm. This algorithm is very secure and is often used to encrypt data that needs to be protected from unauthorized access.

In order for encryption to work, both the sender and recipient need to have the same encryption algorithm and key. If either party does not have these items, then the document cannot be encrypted and will be visible to anyone who sees it.

Uses of hash algorithm

The use of a hash algorithm is important when verifying a document was sent by the person it says it is from. A hash algorithm is a mathematical function that takes an input of data and produces a unique output. The function depends on the data and how it has been processed, making it difficult to tamper with the data. This makes it an ideal verification tool for documents.

One common use of hash algorithms is in online security. When you log in to your online account, your computer will often request a hash of the password you enter. This hash is then used to verify that you are who you say you are and to protect your account from being hacked.

Hash algorithms can also be used to verify the authenticity of documents. If you receive a document that you believe was sent by someone else, you can use a hash algorithm to verify that the document was actually sent by the person it says it was from. This can be helpful if you are unsure who sent you a document or if you received a document that has been tampered with.

Hash algorithms can be used in many different ways, and they are becoming more popular as security tools and as ways to verify the authenticity of documents.

The Different Types of Encryption

There are a number of different encryption applications that can be used to verify that a document was sent by the person it says it is from.

One common application is digital signature encryption. This type of encryption uses a digital signature to create a verification mechanism.

The sender must also have the digital signature of the person they are sending the document to in order to validate the authenticity of the document. Another common application of encryption is message authentication code (MAC) encryption. This type of encryption uses an algorithm to create a MAC value for each individual data block in a message. If the MAC values for all of the data blocks in a message match, then the message can be considered authentic.

The Method of Verification

The verification method of encryption is based on the assumption that only the sender and the receiver of a document can read it. The sender encrypts the document with their private key and sends it to the receiver. The receiver then uses their public key to decrypt the document and verify that it was sent by the sender. This method is effective because there is no way for someone else to decrypt the document unless they have both the sender’s private and public keys.

How to calculate the message digest?

If you need to verify the authenticity of a document, you can use its message digest. A message digest is simply a mathematical formula that takes every letter and number in a text file and produces a numeric value. This value can be used to identify certain patterns in the text file. For example, if you wanted to know if a document contained any specific words or phrases, you could use the message digest to check for those specific words or phrases.

To calculate a message digest, you first need to convert the text file into an ASCII-formatted string. Next, you need to calculate the MD5 hash of the ASCII-formatted string. The MD5 hash is a 128-bit value that contains information about the layout of the characters in the string. Finally, you need to convert the MD5 hash into a 32-bit value.

What Application of Encryption Verifies That a Document Was Sent by The Person it Says it is From?

There are a few ways to verify that a document was sent by the person it says it is from.

  1. One way is to use encryption to ensure that only the intended recipient can read the document. This can be done through a digital signature, which is a type of security mechanism used to ensure the accuracy and authenticity of a document. 
  2. Additionally, some websites offer email verification services, which help to ensure that the sender and receiver are actually who they say they are.


There are a number of ways that encryption can be used to verify the authenticity of a document. One way is to use digital signatures, which allow for the verification of who sent the document and when it was sent. Another way is to use hashes to create an electronic fingerprint that can be used to identify the sender and track their movements. Whatever method you choose, make sure that it meets your specific needs and requirements and that you are comfortable with its security implications.

Mark Funk
Mark Funk is an experienced information security specialist who works with enterprises to mature and improve their enterprise security programs. Previously, he worked as a security news reporter.