Lesezeit: 6 mins | 30. August 2021
A secure encrypted cloud solution is essential for any business, but many are not exactly sure what the different encryption methods involve or mean.
Encryption generally refers to a method that converts plain text into unreadable characters using a key. The encrypted text can be decrypted again using the same key.
More and more data is being processed, stored, and transmitted digitally, which is why the reasons for secure encryption are increasing at the same time. The risks of data loss or misuse are well known. This article will describe common methods in more detail and illustrate them using various examples.
In general, there are different types of encryption technologies. These include:
1. Symmetric encryption
2. Asymmetric encryption
3. Hybrid encryption
Therefore, there are various methods that apply these encryption types.
Since the exchange of the key should be kept secret, the key exchange problem arises at this point. A secure way must be found to exchange the key. The safest way would be a personal meeting, which is often not practical.
If multiple messages are sent to different participants, the number of keys quickly increases.
= also known as "public key encryption"
Asymmetric encryption requires two keys. The key for encryption is public and accessible to everyone, while the key for decryption is private.
Asymmetric encryption has the advantage of providing high security that cannot be easily cracked by attackers. This method can also bypass the key exchange problem or create digital signatures that serve for authentication.
More about digital signatures can be found in the section that discusses the RSA algorithm.
Despite the high security offered by this method, it is very computationally intensive and complex, especially when encrypting large amounts of data.
Thus, the method is also much slower than the symmetric method.
The hybrid encryption is a mix of both encryption methods. For example, a symmetric key is exchanged using the asymmetric encryption method, so that the actual communication takes place symmetrically.
This not only avoids the computationally intensive and slow asymmetric method, but also the key exchange problem.
Find out more about the encryption used by LeitzCloud on our website.
The name RSA comes from the first letters of the surnames of the mathematicians who discovered the method.
This is one of the most commonly used asymmetric methods, which is used to encrypt and create digital signatures.
RSA has the properties that plaintext letters are not always the same ciphertext letters. It also consists of a key pair - the private key cannot be calculated from the public one. This method is therefore considered secure, as there is currently no algorithm that can factorize a number larger than 789 bits into its prime factors. Modern RSA encryptions therefore have a minimum length of 3072 bits.
To decrypt an RSA system, additional information is required, which is only contained in the private key.
The private key consists of a one-way function, meaning that the function is easy to calculate but cannot be reversed. The required additional information makes it easy to perform the reversal again.
The private key is used to create a signature that is attached to the transmitted message. If a third party intercepts the communication channel, they can also verify the sender's authentication.*
The digital signature is also encrypted with the recipient's public key, so only they can verify the authenticity of the sender.
*The authenticity of the sender does not necessarily need to be kept secret at this point.
The AES algorithm is a symmetric encryption method that uses only one key.
AES is a block cipher, and the block size depends on the key length. The length can be 128, 192, or 256 bits.
The predecessor DES = "Data Encryption Standard" was replaced by AES = "Advanced Encryption Standard" due to its short key length of 56 bits.
As computer processing power increased, DES was no longer able to provide sufficient security.
The special feature of this encryption technology is the transformation applied to each block.
This process is applied in various areas, including data transfer using WLAN or VPNs, or in general data transfer.
Secure your data in a securely encrypted cloud, with a sustainable data center in Germany.
E2EE promotes data privacy, as there is no access to personally identifiable information, while also preventing unwanted access to data exchange.
Furthermore, it is a secure method of communication since the key granting access is only known by the sender and receiver.