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    • 7. 发明申请
    • Hacksaw with Blade Tensioning Mechanism
    • 钢锯与叶片张紧机构
    • US20100132203A1
    • 2010-06-03
    • US12626377
    • 2009-11-25
    • Matthew GreenJoseph NovakPeter Weremchuk
    • Matthew GreenJoseph NovakPeter Weremchuk
    • B27B21/06
    • B23D49/12B23D51/125
    • A hacksaw with an improved mechanism for applying and adjusting the tension on a blade mounted to a blade mount on a front arm and a blade mount on a rocker arm. The rocker arm is pivotally coupled to a handle and is spring biased to place an initial tension on a blade held by the rocker arm and the front arm. A rotatably mounted lever is positioned on the handle for vertically displacing a nut captured in the rocker arm to pivot the rocker arm and adjust the tension on the rocker arm-held blade. An elongate top frame bar of the hacksaw defines a hollow I-beam cross-section accessible from the face of the front handle and is capable of storing saw blades. A bale screw is positioned in the front member for securing the blades in a position extending past the front handle.
    • 具有改进的机构的钢锯,用于施加和调节安装到前臂上的刀片安装件上的刀片上的张力和在摇臂上的刀片安装件。 摇臂枢转地联接到手柄并且被弹簧偏置以将初始张力放置在由摇臂和前臂保持的刀片上。 可旋转地安装的杠杆位于手柄上,用于垂直移动捕获在摇臂中的螺母以枢转摇臂并调节摇臂支撑叶片上的张力。 钢锯的细长顶框架限定了可从前手柄的表面接近的中空的I型梁横截面,并且能够存储锯片。 捆扎螺钉位于前部构件中,用于将叶片固定在延伸通过前手柄的位置。
    • 8. 发明申请
    • Unidirectional proxy re-encryption
    • 单向代理重新加密
    • US20080059787A1
    • 2008-03-06
    • US11347794
    • 2006-02-03
    • Susan R. HohenbergerKevin FuGiuseppe AtenieseMatthew Green
    • Susan R. HohenbergerKevin FuGiuseppe AtenieseMatthew Green
    • H04L9/00
    • H04L9/3013H04L9/3073H04L2209/08H04L2209/76
    • A method for performing unidirectional proxy re-encryption includes generating a first key pair comprising a public key (pk) and a secret key (sk) and generating a re-encryption key that changes encryptions under a first public key pka into encryptions under a second public key pkb as rkA→B. The method further includes performing one of the group consisting of encrypting a message m under public key pka producing a ciphertext ca, re-encrypting a ciphertext ca using the re-encryption key rkA→B that changes ciphertexts under pka into ciphertexts under pkb to produce a ciphertext cb under pkb, and decrypting a ciphertext ca under pka to recover a message m. The method also includes encrypting a message m under a public key pk producing a first-level ciphertext c1 that cannot be re-encrypted, and decrypting a first-level ciphertext c1 using secret key sk.
    • 一种用于执行单向代理重新加密的方法包括:生成包括公开密钥(pk)和秘密密钥(sk)的第一密钥对,并产生重新加密密钥,该重新加密密钥改变第一公共密钥pk < / SUB>转换为第二个公钥pk 下的加密。 该方法还包括执行以下组中的一个:在产生密文c 的公钥pk 下对消息m进行加密,使用重新加密密文ca, 加密密钥rk A> B>将将pk 下的密文改为在pk 下的密文,以产生密文c SUB>在pk 下,解密pk 下的密文c 以恢复消息m。 该方法还包括在产生无法重新加密的第一级密文c <1> 1的公开密钥pk下对消息m进行加密,以及解密第一级密文c 1 >使用秘密密钥sk。