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2h
comment mapping function
@yomma: for notations and foundations of cryptography, I like the Handbook of Applied Cryptography. However it does not cover some advanced subjects used in the article, in particular  bilinear pairings.
3h
comment mapping function
@yomna: no, that definition does not say a thing about what $H_0$ is beyond from what set to what set. And it precludes that it is exactly (e.g.) SHA-1, since that has output set $\{0,1\}^{160}$. One option perhaps would be: $SHA-512(x)\bmod p$ (using big-endian convention from 512-bit bitstring to integer), especially if $p\ll2^{512}$
19h
comment Given a linear block-cipher,how can an attacker decrypt any plaintext value encrypted,using 128 chosen ciphertexts
That's a possible definition of a linear cipher, but there are more general ones, that do not require $\operatorname{LinCipher}(k, 0) = 0$; that would be the weaker:$$\operatorname{LinCipher}(k, p_1 \oplus p_2 \oplus p_3) = \operatorname{LinCipher}(k, p_1) \oplus \operatorname{LinCipher}(k, p_2) \oplus \operatorname{LinCipher}(k, p_3)$$which is common in cryptanalysis.
19h
revised Given a linear block-cipher,how can an attacker decrypt any plaintext value encrypted,using 128 chosen ciphertexts
use \operatorname
20h
revised mapping function
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20h
revised mapping function
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20h
answered mapping function
21h
revised mapping function
Texify
21h
revised How can I figure out a hash algorithm?
generalize to arbitrary input/output pairs
21h
revised How can I figure out a hash algorithm?
Polish, link to CRC
21h
revised How can I figure out a hash algorithm?
Explicit and correct formula
22h
revised Creating serial key generator using ECDSA, how to get signature short enough?
Polish
22h
revised Creating serial key generator using ECDSA, how to get signature short enough?
Polish
22h
revised Creating serial key generator using ECDSA, how to get signature short enough?
Polish
22h
revised Creating serial key generator using ECDSA, how to get signature short enough?
Hopefully got the numbers right
1d
revised How can I figure out a hash algorithm?
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1d
revised How can I figure out a hash algorithm?
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1d
awarded  Nice Answer
1d
answered How can I figure out a hash algorithm?
1d
comment RSA : Double-Encryption and order of Encryption
Are you making double encryption with naked/textbook RSA at least for the second encryption? If yes, hint: what are the input and output domain for RSA encryption, so that decryption can work (reliably recover what has been encrypted?). What is the condition making it certain that double encryption work, in this sense? Can it be met regardless of the order of encryption?