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Dec
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answered How does this happen in RSA malleability?
Dec
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revised Can you explain “weak keys” for DES?
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answered Can you explain “weak keys” for DES?
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reviewed Approve Can you help me with this DES variant analysis?
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comment Rabin/RSA four possible messages?
Also, yes, the second part is just asking for the decryption algorithm. DrLecter's hint above should help with that too. Note that, for efficient decryption, you'll need to know the factors $p$ and $q$ of $N$.
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revised Rabin/RSA four possible messages?
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revised Can you help me with this DES variant analysis?
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revised Find the key to a Vigenère cipher, given known ciphertext and plaintext
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answered Can you help me with this DES variant analysis?
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revised Find the key to a Vigenère cipher, given known ciphertext and plaintext
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answered Find the key to a Vigenère cipher, given known ciphertext and plaintext
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revised Regex searchable word list for space-less monoalphabetic substitution
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comment Perfect secrecy over Stirling numbers
Ps. Also, yes, if $k$ is uniformly distributed over $\{0,1\}^n$ (i.e. "perfectly random"), then $k' = c_1 \oplus m_1$ $= k \oplus m_0 \oplus m_1$ (where $m_0, m_1 \in \{0,1\}^n$) is also uniformly distributed. This follows easily from the observation that the map $x \mapsto x \oplus m_0 \oplus m_1$ is invertible (and, in fact, its own inverse) on $\{0,1\}^n$.
Dec
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answered Perfect secrecy over Stirling numbers
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answered Regex searchable word list for space-less monoalphabetic substitution