What prevents continued hashing of a key from being used as a cipher when xored with plaintext?
64779
A simple block cipher based on the SHA-256 hash function
41240
Generating a cryptographically secure, many-time use, symmetric encryption key
157959
Difference between encrypting something and hashing something
10729
DES — Can I recover the key when I have both ciphertext and the plaintext?
49053
Knowing the key, how do I decrypt the affine cipher?
115189
Why does CTR mode XOR the plaintext into the output of the block cipher rather than XORing the plaintext into the input of the block cipher?
117157
HMAC versus encrypted hash
54163
What makes a hash function good for password hashing?
112076
How to salt PBKDF2, when generating both an AES key and a HMAC key for Encrypt then MAC?
56732
Can I use a one time pad key twice with random plaintext?
120462
How is a public key actually used to encrypt something?
71414
Whose key is used to encrypt a HTTPS response?
34578
Kerckhoffs’ principles – Why should I make my cipher public?
98841
Is it okay to use an HMAC of the plaintext and a (possibly distinct) key as the IV for symmetric cryptography?
64578
How can an encryption scheme be indistinguishable with multiple messages but vulnerable to an adaptive chosen-plaintext attack?
56777
Purpose of outer key in HMAC
13234
Cracking secret key of a MD5 hash?