Encryption and decryption method and apparatus
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United States of America Patent
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Dec 28, 1999
Grant Date -
N/A
app pub date -
Jan 31, 1997
filing date -
Jan 31, 1997
priority date (Note) -
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Abstract
A method for efficient encryption and decryption (100) comprises the steps of encrypting a message (104) at a sending unit which is to be sent to a receiving unit using a message key (106) and appending to the message at the sending unit the message key encrypted (108 and 109) using a receiver's public key (110). Subsequently, a sender's certificate (116) is appended at a first server (302) and extracted at a second server (310). The message key is then decrypted at the receiving unit using a receiver's private key (140) to provide a decrypted message key. Subsequently the message is decrypted using the decrypted message key (142 & 143) and authenticated by comparing a pair of digest (152 and 156).
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