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16h
comment Do most TLS 1.2 implementations express curves in a canonical form when performing EC arithmetic?
@hodgepodge Every curve is representable in Weiderstrass form, but not every curve is representable in Montgomery/Edwards form. But if it is, you can convert points from weierstrass.
1d
comment Convert ciphertexts of one encryption scheme to another without decryption
Related: Proxy re-encryption
1d
reviewed Approve Caculated time One Point Multiplication with double and method
1d
comment Caculated time One Point Multiplication with double and method
@MaartenBodewes #ADD is supposed to be the number of additions.
2d
comment RSA PKCS#1, v1.5 padding output
I strongly recommend using OAEP instead of PKCS#1 v1.5 padding. Using the latter safely is very tricky and error prone.
2d
revised RSA PKCS#1, v1.5 padding output
deleted 27 characters in body
2d
awarded  Nice Question
2d
comment Is there a standard for hashing a list of strings?
@pg1989 You need the first separator (the :) but not the ,. Owlstead already noted that the encoding becomes ambiguous without the : if the string starts with a number.
Feb
6
revised HRNG for One Time Pad
added 21 characters in body
Feb
6
revised HRNG for One Time Pad
added 8 characters in body
Feb
6
awarded  Nice Answer
Feb
3
comment Block cipher not resistant to collisions
@fgrieu I missed that one. How about posting it as an answer?
Feb
3
comment Block cipher not resistant to collisions
I can't think of an efficient way for finding two $x$, $y$ pairs which produce the same hash. (assuming the block-cipher is ideal and has a sufficiently large block-size)
Feb
2
revised Key Exchange MAC encryption order of events? Problem
added 10 characters in body
Feb
2
revised How does RIPEMD160 pad the message?
edited title
Feb
1
revised Computing inverses in a binary field
edited tags; edited title
Feb
1
awarded  Necromancer
Jan
31
comment Any stream cipher with avalanche effect?
Perhaps you want format-preserving-encryption.
Jan
31
comment Is there a standard for hashing a list of strings?
Assuming you're referring to djbs netstrings, you forgot the separator between the string and the number. Your example would be 4:john,5:smith, when using netstrings.
Jan
31
awarded  Popular Question