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Public key encryption One key is nominated as the private key and is kept secret. The other key is distributed to anyone who wants it; this key is the public key. Anyone can encrypt a message by using your public key, but only you can read it. When you receive the message, you decrypt it by using your private key.

RSA messages are to be decrypted by the private key, not the public key. That's what ?public key encryption? is all about. The public key encrypts, the private key decrypts. I'm not going to regurgitate the detaiuls of the RSA algorithm, which are widely available online including on Wikipedia.

Openssl Extracting Public key from Private key RSA. Generate 2048 bit RSA Private/Public key. openssl genrsa -out mykey.pem 2048. ... DSA. Generate DSA Paramaters. openssl dsaparam -out dsaparam.pem 2048. ... EC. openssl ecparam -name secp256k1 -out secp256k1.pem. openssl ecparam -in secp256k1.pem -genkey -noout -out privkey.pem.

Public key certificates can also come in Cryptographic Message Syntax Standard PKCS#7 format, P7Chain (typically named . p7b or . p7c , but sometimes mischeviously named . cer ) or as part of a PKCS#12 PFX file (typically called .

Fortunately, at the moment, a PKI system using long-length keys (i.e. 2,048 bits) is practically unbreakable due to the level of computing power and time it would take to break the encryption -- if, as you mention, it's properly installed and operated.

The power of public key encryption is in that mathematical operation. It's a "one-way function", which means it's incredibly difficult for a computer to reverse the operation and discover the original data. Even the public key cannot be used to decrypt the data.

A public key is used to encrypt a file and verify a signature. A private key is used by the owner to decrypt files. You must provide your trading partner your public key to encrypt the files they send you. Then you will use your private key to decrypt the files.