公开(公告)号：US20160218861A1

公开(公告)日：2016-07-28

申请号：US14741511

申请日：2015-06-17

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Deukjo HONG ,  Jung Keun LEE ,  Woo-Hwan KIM ,  Daesung KWON

IPC: H04L9/06

CPC classification number: H04L9/0643 ,  H04L2209/30 ,  H04L2209/38

Abstract: An operation apparatus includes a message expansion unit, a state data initiation unit, a state data generation unit, and a chain variable update unit. The message expansion unit generates a plurality of expanded messages using a message. The state data initiation unit generates the initial value of state data using chain variable data. The state data generation unit generates the final value of the state data by iterating a combination function and a step function using the state data and the plurality of expanded messages. The chain variable update unit updates the chain variable data using the state data of the final value.

Abstract translation: 操作装置包括消息扩展单元，状态数据启动单元，状态数据生成单元和链式可变更新单元。 消息扩展单元使用消息生成多个扩展消息。 状态数据发生单元使用链变量数据生成状态数据的初始值。 状态数据生成单元通过使用状态数据和多个扩展消息迭代组合函数和阶梯函数来生成状态数据的最终值。 链变更新单元使用最终值的状态数据更新链变量数据。

公开(公告)号：US20160056954A1

公开(公告)日：2016-02-25

申请号：US14810705

申请日：2015-07-28

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jung Keun LEE ,  Bonwook KOO ,  Dongyoung ROH ,  Woo-Hwan KIM ,  Daesung KWON

IPC: H04L9/06 ,  H04L9/08

CPC classification number: H04L9/0625 ,  H04L9/0861 ,  H04L2209/24

Abstract: An apparatus and method for providing a Feistel-based variable length block cipher, which are configured to when plaintext having a certain bit length is encrypted, generate ciphertext having the same bit length as plaintext, and to decrypt ciphertext into plaintext having the same bit length. The apparatus includes an encryption/decryption key generation unit for generating a number of encryption/decryption keys corresponding to a preset number of rounds, based on a secret key, the length of the secret key, the length of plaintext, and a round constant; an encryption/decryption tweak generation unit for generating an encryption/decryption tweak based on a tweak, a length of tweak, and the length of plaintext; and a ciphertext output unit for outputting ciphertext having length identical to that of plaintext, based on plaintext, the length of the plaintext, the length of the secret key, the encryption/decryption keys, and the encryption/decryption tweak.

Abstract translation: 一种用于提供基于Feistel的可变长度块密码的装置和方法，被配置为当具有特定比特长度的明文被加密时，生成具有与明文相同的比特长度的密文，并将密文解密为具有相同比特长度的明文 。 该装置包括：加密/解密密钥生成单元，用于基于秘密密钥，秘密密钥的长度，明文长度和圆常数生成与预设的轮次数相对应的多个加密/解密密钥; 加密/解密调整生成单元，用于基于调整，调整长度和明文长度生成加密/解密调整; 以及密文输出单元，用于根据明文，明文长度，秘密密钥的长度，加密/解密密钥和加密/解密调整，输出长度与明文长度相同的密文。

公开(公告)号：US20150244518A1

公开(公告)日：2015-08-27

申请号：US14561652

申请日：2014-12-05

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Bonwook KOO ,  Dongyoung ROH ,  Minkyu KIM ,  Woo-Hwan KIM ,  Daesung KWON

IPC: H04L9/06 ,  H04L9/14

CPC classification number: H04L9/0631 ,  G09C1/00 ,  H04L2209/24

Abstract: A variable-length block cipher apparatus and method capable of format preserving encryption are provided. An encryption device for a variable-length block cipher apparatus includes an encryption key generation unit configured to generate encryption round keys eRK0, eRK1, . . . , eRKNr using a secret key and the number of rounds Nr, and a ciphertext output unit configured to output ciphertext having a length identical to that of plaintext using the plaintext and the encryption round keys. 7. A decryption device for a variable-length block cipher apparatus includes a decryption key generation unit configured to generate decryption round keys dRK0, dRK1, . . . , dRKNr using a secret key and a number of rounds Nr, and a plaintext restoration unit configured to restore ciphertext into plaintext having a length identical to that of the ciphertext using the ciphertext and the decryption round keys.

Abstract translation: 提供了一种能够格式化保存加密的可变长度块密码装置和方法。 一种用于可变长度块密码装置的加密装置包括：加密密钥生成单元，被配置为生成加密循环密钥eRK0，eRK1。 。 。 使用秘密密钥的eRKNr和轮数Nr，以及密文输出单元，其配置为使用明文和加密循环密钥输出具有与明文长度相同长度的密文。 7.一种用于可变长度分组密码装置的解密装置，包括：解密密钥生成部，生成解密循环密钥dRK0，dRK1， 。 。 使用秘密密钥和多次Nr的dRKNr，以及明文恢复单元，其被配置为使用密文和解密循环密钥将密文恢复为与密文的长度相同的明文。