Here is a list of best free RSA key generator software for Windows. Using these freeware, you can generate RSA key pair i.e. a pair of public and private keys which are used in encryption and decryption. .
These are basically cryptography software, so you can also encrypt/decrypt text, files, and folders using these.
My Favorite RSA Key Generator Software For Windows
Hyper Crypt is one of my favorite RSA key generator as apart from creating asymmetric keys, you can also create symmetric keys, generate text, file, or folder hash values, encrypt/decrypt files and folder, and securely shred files.
PuTTY Key Generator is also good as it lets you create RSA keys as well as DSA, ECDSA, ED25519, and SSH-1 keys.
1. Hyper Crypt
Hyper Crypt is one of my favorite RSA key generator as apart from creating asymmetric keys, you can also create symmetric keys, generate text, file, or folder hash values, encrypt/decrypt files and folder, and securely shred files.
2. PuTTY Key Generator
PuTTY Key Generator is a dedicated key generator software for Windows. You can generate RSA key pair as well as DSA, ECDSA, ED25519, or SSH-1 keys using it.
In order to create a pair of private and public keys, select key type as RSA (SSH1/SSH2), specify key size, and click on Generate button.
While the key generation process goes on, you can move mouse over blank area to generate randomness.
As the keys are generated, the public key is displayed on the interface with key fingerprint and key comment.
3. RSA Education Cryptosystem
RSA Education Cryptosystem is an RSA cryptography learning tool for Windows. You can use it to create an RSA key pair. It can be used in both Teach and Secure modes.
In Teach mode, you can specify two prime numbers and the value of e. After that, hit the Create keys button and then save private and public keys.
In Learn mode, you can specify a custom key size and click on Create Key and then save them. You can then simply encrypt/decrypt a message.
4. X Certificate and Key management
X Certificate and Key management, as the name suggests, is a free software to create and manage X.509 certificates and private keys.
First, create a database with a passphrase to securely store created RSA private keys.
After that, in the Private Keys tab, click on New Key option and generate a private key by specifying key name and key size. This way, you can generate and store multiple RSA private keys to the database. You can view details of RSA key such as key, public exponent, private exponent, etc.
5. Cryptermite
Cryptermite is a free software to encrypt/decrypt files using AES, Serpent, TwoFish, BlowFish, Triple DES, and RSA encryption algorithms.
It also lets you generate RSA keys of 1024, 2048, 4096, and 8196 bits. To generate RSA key pair, enter a password, then specify owner of keys in Input box, and then go to Generate RSA Keys menu and select a key size.