Method and apparatus for encrypting and decrypting information using a digital chaos signal
First Claim
1. A method of encrypting and decrypting information in plaintext, comprising the steps of:
- encrypting information in plaintext by adding to each group of signals in the information a digital chaos signal based on a chaos function which is selected from plural chaos functions by a cryptographic key, a delay, an initial value, and a chaos-attractor-control parameter of the chaos function determined using the cryptographic key, wherein the cryptographic key can be any length and any combination of letters, numerals, and words; and
decrypting the encrypted information by decrypting each group of signals in the encrypted information using a digital chaos signal generated using the cryptographic key used in the encryption.
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Abstract
In an encryption and decryption system, information in plaintext is encrypted by adding to each group of signals in the information a digital chaos signal in accordance with a chaos function, a delay, an initial value, and parameters of the chaos function determined using a cryptographic key which can be any length and any combination of letters, numerals, or words. The encrypted information is decrypted by decrypting each group of signals in the encrypted information using a digital chaos signal which is generated using the same key as that used in the encryption. Accordingly, it is possible to provide enhanced secrecy and to perform encryption and decryption of information at high speed.
37 Citations
8 Claims
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1. A method of encrypting and decrypting information in plaintext, comprising the steps of:
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encrypting information in plaintext by adding to each group of signals in the information a digital chaos signal based on a chaos function which is selected from plural chaos functions by a cryptographic key, a delay, an initial value, and a chaos-attractor-control parameter of the chaos function determined using the cryptographic key, wherein the cryptographic key can be any length and any combination of letters, numerals, and words; and decrypting the encrypted information by decrypting each group of signals in the encrypted information using a digital chaos signal generated using the cryptographic key used in the encryption. - View Dependent Claims (5)
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2. A method of encrypting and decrypting information in plaintext, comprising the steps of:
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encrypting information in plaintext by adding to each group of signals in the information a digital chaos signal based on a chaos function which is selected from plural chaos functions by a first cryptographic key, a delay, an initial value, and a chaos-attractor-control parameter of the chaos function determined using the first cryptographic key, wherein the first cryptographic key can be any length and any combination of letters, numerals, and words; repeating at least one time the encrypting step while using at least a second cryptographic key instead of the first cryptographic key; decrypting the encrypted information by decrypting each group of signals in the encrypted information using a digital chaos signal generated using the first cryptographic key; and repeating at least one time the decrypting step while using at least the second cryptographic key instead of the first cryptographic key. - View Dependent Claims (6)
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3. An apparatus for encrypting and decrypting information in plaintext, comprising:
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means for encrypting information in plaintext by adding to each group of signals in the information a digital chaos signal based on a chaos function which is selected from plural chaos functions by a cryptographic key, a delay, an initial value, and a chaos-attractor-control parameter of the chaos function determined using the cryptographic key, wherein the cryptographic key can be any length and any combination of letters, numerals, and words; means for transmitting the encrypted information; means for receiving the encrypted information; and means for decrypting the received information by decrypting each group of signals in the received information using a digital chaos signal generated using the cryptographic key used in the encryption means. - View Dependent Claims (7)
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4. An apparatus for encrypting and decrypting information in plaintext, comprising:
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means for encrypting information in plaintext by adding to each group of signals in the information a digital chaos signal based on a chaos function which is selected from plural chaos functions by a first cryptographic key, a delay, an initial value, and a chaos-attractor-control parameter of the chaos function determined using the first cryptographic key, wherein the cryptographic key can be any length and any combination of letters, numerals, and words; means for repeating at least one time the encryption of the information while using at least a second cryptographic key instead of the first cryptographic key; means for transmitting the encrypted information; means for receiving the encrypted information; means for decrypting the received information by decrypting each group of signals in the received information using a digital chaos signal generated using the first cryptographic key; and means for repeating at least one time the decryption of the information while using at least the second cryptographic key instead of the first cryptographic key. - View Dependent Claims (8)
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Specification