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Ssh provides secure access to the remote system. The traffic between systems are encrypted using encryption algorithms. There are different encryption algorithms. RSA
is the most popular asymmetric encryption algorithm. In this tutorial we will look how to create RSA keys with ssh-keygen
AES (acronym of Advanced Encryption Standard) is a symmetric encryption algorithm. The algorithm was developed by two Belgian cryptographer Joan Daemen and Vincent Rijmen. AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits. Use AES in Web Crypto with public/private key pair. Using an AES-256-GCM key as a salt to SHA-256. To generate the public/private key pair, enter this in the Command Prompt: ssh-keygen At the first prompt, “Enter file in which to save the key,” press Enter to save it in the default location.
RSA algorithm is created by researchers named Ron Rivest, Adi Shamir and Leonard Adleman in the MIT. And named with their names first letters. It is asymmetric or public encryption algorithm provides a lot of flexibility. We can generate different size of keys with RSA. RSA is used to make secure SSH, OpenGP, S/MIME, SSL/TLS etc.
Actually ssh-keygen
will create RSA keys by default. So we do not have to specify the algorithm but in order to be sure and provide information we can explicitly specify the RSA key creation. We will use -t
option in order to specify the RSA algorithm.
By default RSA key is generated into user home directory ~/.ssh/id_rsa
. We can change this default directory during the generation or by providing the path as parameter. We will use -f
option in order to change path and file name. We will create key named test
in to the current working directory.
There will be two files named;
Aes 256 Encryption Software
test
is the private keytest.pub
is the public key
Advanced Encryption Standard(AES) is a symmetric encryption algorithm. AES is the industry standard as of now as it allows 128 bit, 192 bit and 256 bit encryption.Symmetric encryption is very fast as compared to asymmetric encryption and are used in systems such as database system. Following is an online tool to generate AES encrypted password and decrypt AES encrypted password. It provides two mode of encryption and decryption ECB and CBC mode. For more info on AES encryption visit this explanation on AES Encryption.
Also, you can find the sample usage screenshot below:
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Usage Guide
Any plain-text input or output that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that text cannot be stolen.
For encryption, you can either enter the plain text, password, an image file or a .txt file that you want to encrypt. Now choose the block cipher mode of encryption. ECB(Electronic Code Book) is the simplest encryption mode and does not require IV for encryption. The input plain text will be divided into blocks and each block will be encrypted with the key provided and hence identical plain text blocks are encrypted into identical cipher text blocks. CBC mode is highly recommended and it requires IV to make each message unique. If no IV is entered then default will be used here for CBC mode and that defaults to a zero based byte[16].
The AES algorithm has a 128-bit block size, regardless of whether you key length is 256, 192 or 128 bits. When a symmetric cipher mode requires an IV, the length of the IV must be equal to the block size of the cipher. Hence, you must always use an IV of 128 bits (16 bytes) with AES.
AES provides 128 bit, 192 bit and 256 bit of secret key size for encryption. Things to remember here is if you are selecting 128 bits for encryption, then the secret key must be of 16 bits long and 24 and 32 bits for 192 and 256 bits of key size. Now you can enter the secret key accordingly. By default, the encrypted text will be base64 encoded but you have options to select the output format as HEX too.
Similarly, for image and .txt file the encrypted form will be Base64 encoded.
Below is a screenshot that shows a sample usage of this online AES encryption tool.
AES decryption has also the same process. By default it assumes the entered text be in Base64. The input can be Base64 encoded or Hex encoded image and .txt file too. And the final decrypted output will be Base64 string. If the intended output is a plain-text then, it can be decoded to plain-text in-place.
Aes 256 Java
But if the intended output is an image or .txt file then you can use this tool to convert the base64 encoded output to an image.