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Private key VS public key

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Hello ,

I need to know the difference between private key and public key in the web service security context.

If client will send a message to the service provider , who should have public and who should have private key ?
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The answer and more useful information you can find here.
Particular answer to your question is also is as a quote from link above

Oracle Web Services Manager wrote:In many cases, Web services security tools such as OWSM rely on Public Key Infrastructure (PKI) environments. A PKI uses cryptographic keys (mathematical functions used to encrypt or decrypt data). Keys can be private or public. In an asymmetric cipher model, the receiving party's public key is used to encrypt plaintext, and the receiving party's matching private key is used to decrypt the ciphertext. Also, a private key is used to create a digital signature by signing the message, and the public key is used for verifying the signature. Public-key certificates (or certificates, for short) are used to guarantee the integrity of public keys.

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