Encrypted communication system and communication device
    11.
    发明授权
    Encrypted communication system and communication device 有权
    加密通信系统和通信设备

    公开(公告)号:US07813512B2

    公开(公告)日:2010-10-12

    申请号:US10573684

    申请日:2004-10-18

    IPC分类号: H04L9/08

    摘要: In an encrypted communication system that includes a first and a second device, the first device encrypts a 1st key using a public key of the second device to generate 1st encrypted data, which is then transmitted to the second device, receives 2nd encrypted data from the second device, which is then decrypted using a secret key of the first device to obtain a 2nd key, and generates, based on the 1st and 2nd keys, a 1st encryption key for use in communication with the second device. The second device encrypts a 3rd key using a public key of the first device to generate the 2nd encrypted data, which is then transmitted to the first device, receives the 1st encrypted data, which is then decrypted using a secret key of the second device to obtain a 4th key, and generates, based on the 3rd and 4th keys, a 2nd encryption key for use in communication with the first device. The first and second devices perform encrypted communication using the 1st and 2nd encryption keys.

    摘要翻译: 在包括第一和第二设备的加密通信系统中,第一设备使用第二设备的公开密钥对第一密钥进行加密,以生成第一加密数据,然后将其传送到第二设备,从第二设备接收第二加密数据 第二设备,然后使用第一设备的秘密密钥解密以获得第二密钥,并且基于第一和第二密钥生成用于与第二设备通信的第一加密密钥。 第二设备使用第一设备的公开密钥对第三密钥进行加密以生成第二加密数据,然后将其传送到第一设备,接收第一加密数据,然后使用第二设备的秘密密钥将其解密 获得第四密钥,并且基于第三和第四密钥生成用于与第一设备通信的第二加密密钥。 第一和第二设备使用第一和第二加密密钥执行加密通信。

    Cryptocommunication system, transmission apparatus, and reception apparatus
    12.
    发明授权
    Cryptocommunication system, transmission apparatus, and reception apparatus 失效
    加密通信系统,发送装置和接收装置

    公开(公告)号:US07155610B2

    公开(公告)日:2006-12-26

    申请号:US10020308

    申请日:2001-12-18

    IPC分类号: H04L9/00

    CPC分类号: H04L9/3236

    摘要: A transmission apparatus performs a one-way operation on plaintext to generate a first value and transmits the first value, generates first additional information, performs an invertible operation on the plaintext and first additional information to generate connected information, encrypts the connected information using an encryption algorithm to generate ciphertext, and transmits the ciphertext. A reception apparatus receives the first value and the ciphertext, generates second additional information identical to the first additional information, decrypts the ciphertext using a decryption algorithm, which is an inverse-conversion of the encryption algorithm, to generate decrypted connected information, decrypts the decrypted connected information and the second additional information according to an inverse of the invertible operation to generate decrypted text, performs the one-way operation on the decrypted text to generate a second value, compares the first and second values, and judges that the decrypted text is valid only when the first and second values match.

    摘要翻译: 发送装置对明文执行单向操作以生成第一值并发送第一值,生成第一附加信息,对明文执行可逆操作和第一附加信息以生成连接信息,使用加密来加密所连接的信息 算法生成密文,并发送密文。 接收装置接收第一值和密文,生成与第一附加信息相同的第二附加信息,使用作为加密算法的逆变换的解密算法对密文进行解密,生成解密的连接信息,解密解密的 连接信息和第二附加信息,根据可逆操作的反向产生解密文本,对解密文本执行单向操作以生成第二值,比较第一和第二值,并且判断解密文本是 仅当第一个和第二个值匹配时才有效。

    Encryption apparatus, decryption apparatus and encryption system
    13.
    发明授权
    Encryption apparatus, decryption apparatus and encryption system 有权
    加密装置,解密装置和加密系统

    公开(公告)号:US07394902B2

    公开(公告)日:2008-07-01

    申请号:US10680294

    申请日:2003-10-08

    IPC分类号: H04L9/00 H04L9/32

    摘要: The present invention pertains to a transmission apparatus for generating an encrypted text by encrypting a plaintext, which includes a parameter storage unit for storing a random parameter (the number of terms whose coefficients indicate 1) adapted to an encryption key and an encryption apparatus and a decryption apparatus; an encryption unit for generating, from the plaintext, the encrypted text using the encryption key and the random parameter stored in the parameter storage unit, complying with an encryption algorithm based on the NTRU™ method; and a key updating unit for updating the random parameter stored in the parameter storage unit and the encryption key, as time passes.

    摘要翻译: 本发明涉及一种用于通过加密明文生成加密文本的发送装置,该明文包括用于存储适于加密密钥的随机参数(系数表示1的术语数量)和加密装置的参数存储单元,以及 解密装置; 使用加密密钥和存储在参数存储单元中的随机参数从明文生成加密文本的加密单元,符合基于NTRU TM方法的加密算法; 以及密钥更新单元,用于随着时间的过去更新存储在参数存储单元中的随机参数和加密密钥。

    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry
    17.
    发明授权
    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry 有权
    用于分发具有使用期满的内容的分发系统,配送装置和接收装置

    公开(公告)号:US07386618B2

    公开(公告)日:2008-06-10

    申请号:US10431500

    申请日:2003-05-08

    IPC分类号: G06F15/16

    CPC分类号: G06F21/10 G06F2221/2137

    摘要: A reception apparatus includes a first timer and sends to a distribution apparatus a first date-time clocked by the first timer. The distributing apparatus includes a second timer, and generates expiry information based on a difference obtained by subtracting, from the first date-time, a second date-time that is clocked by the second timer. The expiry information is used to adjust a usage expiry date-time of content. The reception apparatus judges whether playback of the content is permitted based on the first timer and the expiry information. With this arrangement, unauthorized use of the content beyond the expiry date-time is prevented.

    摘要翻译: 接收装置包括第一定时器,并且向配送装置发送由第一定时器计时的第一日期时间。 分发装置包括第二定时器,并且基于通过从第一日期时间减去由第二定时器计时的第二日期时间而获得的差产生到期信息。 过期信息用于调整内容的使用期限日期时间。 接收装置基于第一定时器和到期信息判断是否允许内容的回放。 通过这种安排,防止超出期满日期时间的内容的未经授权的使用。