Importance

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Abstract

A computer-readable recording medium recording a character code encryption program capable of encrypting character codes without changing the data length. When plaintext is input, a plaintext encoder converts character codes included in the plaintext to corresponding numerical values. Then, an encryptor successively acquires the numerical values of the individual character codes, obtained by the plaintext encoder, to encrypt the first numerical value into an encrypted value with an identical number of bits, by using an initial value set in a register, and then to encrypt the rest of the input numerical values by alternately repeating updating of the register value by using at least part of the encrypted value and encryption of the numerical value by using the updated register value. A character code generator converts the individual encrypted values obtained by the encryptor to corresponding character codes, thereby generating ciphertext.

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First Claim