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Proxy re-encryption
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<p>Proxy re-encryption (PRE) schemes are <a href="/facts/Cryptosystems/GyDVJ4D0">cryptosystems</a> which allow third parties (<a href="/facts/Proxy_server/ArhwQE74">proxies</a>) to alter a <a href="/facts/Ciphertext/luNTs4sY">ciphertext</a> which has been <a href="/facts/Encryption/16q29Fdv">encrypted</a> for one party, so that it may be decrypted by another. </p>