Cryptography
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Caesar cipher (JavaScript)
Vigenère cipher (JavaScript)
Automatic Caesar cipher breaker (JavaScript)
Tiny Encryption Algorithm in x86 assembly
RC4 cipher in x86 assembly
Fast MD5 hash implementation in x86 assembly
Fast SHA-1 hash implementation in x86 assembly
Fast Whirlpool hash in x86 assembly
NotepadCrypt format decrypter (Java)
Fast SHA-2 hashes in x86 assembly
AES cipher internals in Excel
DES cipher internals in Excel
Lowest SHA-512 value by brute force
Native hash functions for Java
Bitcoin cryptography library
Cryptographic primitives in plain Python
Java BigInteger was made for RSA cryptography
Encrypted backup client for Dropbox
Elliptic curve point addition in projective coordinates
Time-based One-Time Password tools