METHOD AND APPARATUS FOR DECRYPTING CRYPTOGRAM USING AUXILIARY SECRET KEY

An apparatus and a method for decrypting cryptogram through steps of: dividing a cryptogram received from a server into a first cryptogram and a second cryptogram; transforming the first cryptogram and the second cryptogram by using a predetermined inverse transform; and decrypting the cryptogram to...

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Bibliographische Detailangaben
Hauptverfasser:	LEE, Nam Yong, PARK, Hea Sook, LEE, Hyung Kyu
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PHYSICS SEALS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	An apparatus and a method for decrypting cryptogram through steps of: dividing a cryptogram received from a server into a first cryptogram and a second cryptogram; transforming the first cryptogram and the second cryptogram by using a predetermined inverse transform; and decrypting the cryptogram to generate a plaintext based on a Feistel network including XOR operations between the transformed first cryptogram and a round key generated from a secret key and between the transformed second cryptogram and the round key are provided.