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Cryptography
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Henno Brandsma

Got a PhD in topology in 98, now a cryptographer and security researcher.

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17 Why is PuTTYgen-created RSA public exponent(e) not in {3,17,65537}? Nov 25 '15
11 How to attack a classical cipher using known partial plaintext? Oct 12 '11
11 How is LUKS dm-crypt secure if the key is stored with the encrypted data? Feb 22 '14
9 What are the main weaknesses of a Playfair cipher, if any? Oct 1 '12
8 Understanding MACs and why cleartext is sent over Jul 8 '18
7 What causes first block of AES decryption to be garbled, even with correct IV? Sep 16 '11
7 AES Inverse Key Schedule Dec 22 '15
6 Why is the XOR of plaintexts equal to the XOR of ciphertexts with a two time pad? Nov 8 '15
6 What are preimage resistance and collision resistance, and how can the lack thereof be exploited? Nov 12 '11
6 AES column mixing and S-Box confusion Dec 11 '13
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