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85/80 answers
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 Enlightened
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~526k people reached

May
19
reviewed Leave Open Does failure of indistinguishability of encryptions imply lack of CPA-security?
May
19
comment Elliptic Curve Cryptography Encryption and text representation implementation
Is implementing ECIES allowed? That's a way of doing public key encryption with Elliptic Curves that doesn't involve translating the plaintext into a point.
May
19
revised Post-quantum authenticated encryption
added 101 characters in body
May
19
revised Post-quantum authenticated encryption
added 238 characters in body
May
19
answered Post-quantum authenticated encryption
May
19
reviewed Leave Open Building a combined encryption scheme from two encryption schemes that's secure if at least on of them is secure
May
19
reviewed Delete Post-quantum authenticated encryption
May
19
reviewed No Action Needed Is the hash function defined in this exercise collision-resistant?
May
19
reviewed No Action Needed Elliptic Curve Cryptography Encryption and text representation implementation
May
18
comment What are some hashes that do not exhibit the avalanche effect?
Also, what security properties do you need from the hash? Collision resistance (we can't find two messages that hash to the same value)? Preimage resistance (given a value, we can't find a message that hashes to that value)?
May
18
comment Which of these is a secure MAC?
@user110219: I still don't understand how we are in danger; if the attacker has two message/tag pairs $(M_1, T)$ and $(M_2, T)$, how can they use that to find a tag for a third message?
May
18
comment Which of these is a secure MAC?
@user110219: how would security be compromised? Remember, MACs need not be compromised if you find a 'collision'; that are compromised if the attacker finds a new message/tag pair.
May
17
revised On composition of encryption schemes
added 392 characters in body
May
17
comment On composition of encryption schemes
Yes, we need to assume that the keys are independent; I'll update my answer accordingly
May
17
answered On composition of encryption schemes
May
17
awarded  Enlightened
May
17
awarded  Nice Answer
May
16
revised Elliptic curve brute forcing
edited body
May
15
reviewed Reject Does the plaintext have to be at least as long as the key in Polyalphabetic substituion cipher
May
15
reviewed No Action Needed Encryting data with password for local storage using libsodium