ENCRYPTION METHOD, DECRYPTION METHOD, ENCRYPTION APPARATUS, DECRYPTION APPARATUS AND ENCRYPTION/DECRYPTION SYSTEM

ENCRYPTION METHOD, DECRYPTION METHOD, ENCRYPTION APPARATUS, DECRYPTION APPARATUS AND ENCRYPTION/DECRYPTION SYSTEM

PROBLEM TO BE SOLVED: To prevent a first ciphertext block from becoming a step to decryption when encrypting plaintext in an encryption block chain mode, and to make a length of ciphertext equal to that of plaintext.SOLUTION: When encrypting plaintext (M1...Mn) in an encryption block chain mode, an...

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Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: HANDA FUKIO, YANO YOSHIHIRO
Format: Patent
Sprache:eng
Schlagworte:
ADVERTISING
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY
CRYPTOGRAPHY
DISPLAY
EDUCATION
PHYSICS
SEALS
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Zusammenfassung:PROBLEM TO BE SOLVED: To prevent a first ciphertext block from becoming a step to decryption when encrypting plaintext in an encryption block chain mode, and to make a length of ciphertext equal to that of plaintext.SOLUTION: When encrypting plaintext (M1...Mn) in an encryption block chain mode, an encryption apparatus 10 encrypts plaintext (P, M1...Mn) in which a preblock (P) generated by a preblock generator 12 is added to the head, and defines a result of removing ciphertext block (Cp) corresponding to the preblock (P) from ciphertext (Cp, C1...Cn) obtained by encrypting the plaintext (P, M1...Mn) as ciphertext (C1...Cn) of the plaintext (M1...Mn).