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After all of this, a, b, c, and d are added to A, B, C, D, respectively, and the algorithm continues with the next block of data. The final output is the concatenation of A, B, C, and D. ... FF (a, b, c, d, M 12 , 7, 0x6b901122) FF (d, a, b, c, M 13 Those constants, t i , were chosen as follows: In step i, t i is the integer part of 2 32 *abs(sin(i)), where i is in radians. ... Initialization Vector To initialize the CFB process, the input to the block algorithm must be initialized with an IV. Like the IV used in CBC mode, it need not be secret. ...doi:10.1016/0267-3649(94)90017-5 fatcat:y5tchirflfdwno7dm4dv6ljx2a
Auto-recoverable Cryptosystems Another way of escrowing keys with a verifiable proof was presented in the year 2000 by Young and Yung. ... They dealt with the topic of auto-certifiable and auto-recoverable cryptosystems  in general and published an implementation of it based on ElGamal  in 1999. ... Therefore this paper will focus on infrastructures with RSA keys to escrow. Requirements The usage of Key Escrow comes along with several problems and unwanted features. ...doi:10.2313/net-2017-05-1 fatcat:mclttwbtfzdp5bafwo7ymp5jaq