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2 votes
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Brute force against DES

For the question as originally asked with a single pair of $E_1$ and $E_2\ne E_1$ that have been obtained as $E_1=\operatorname{DES-Enc}_{K_1}(M)$ and $E_2=\operatorname{DES-Enc}_{K_2}(M)$ for unknown ...
fgrieu's user avatar
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How Secure Is Splitting A Bitcoin Private Key?

This answer, and the question, assume that the public key is not available to the attacker. This is unusual in cryptography, but a possibility in Bitcoin, where the hash of the public key (known as ...
fgrieu's user avatar
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6 votes
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In Bitcoin, given half the 52-character private key in WIF format, is it possible to reconstruct the whole private key?

We must first wonder if the preconditions hold, in particular 1; that is: In Bitcoin, given half the 52-character private key in WIF format, is it possible to reconstruct the whole private key? The ...
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Given and encrypted message, is it theoretically possible to decrypt a message without the key or guessing it? If so, what methods could be used?

In general no, properly applied AES+CBC with proper key and IV is secure. Known attacks are far from practical. However, if the message is guessable, there are many practical scenarios where one could ...
Meir Maor's user avatar
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